Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08f364b9ca10b36…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ee399a86b48d86b3f614941ec257660 SHA-1: 251051219976e940337f13c4032aa1ac54dcec41 SHA-256: c08f364b9ca10b36697c4e8be8bedcd7d3b5774514cb690abe9cbd466bcac1b9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically-generated URLs and a link farm on disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' and 'SE_CALLBACK_LURE' heuristics suggest the document is designed to trick users into making fraudulent payments or engaging with a callback scam. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the ML classifier's high confidence score point towards a likely payload delivery or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=sbi+account+opening+form+fill+up+pdf PDF link annotation
    • https://bya-ingenieria.com/ckfinder/userfiles/files/nozinakelasukoxusanowida.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/58bb86ded823738e56001a484182f492/10127670319.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/b6b1rpncv9ciqt3dutl32p4e9k/66505912718.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608167e5384ca---61528604229.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/tohosld1c0o5fss8ilguhv1v96/96635942749.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/wadawowu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160804341ef047---49742698739.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7f5f1a723f---60066880826.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/nezeritatubiz.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210818060755.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160922b3505cbe---wuwowemozigodapiposipoba.pdfIn PDF document text
    • http://jngf.cn/files/file/50900791924.pdfIn PDF document text
    • http://dzbnf.com/upload/file///nunuziketed.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rlg7bsphie2le28oeh0ac859u4/degero.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/65839271818.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/567adc9a5df90084f920719e8a7a8b6a/3314766738.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/baacb0a57f8a6f18cc932d30be5115c6/sovego.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c5e39b413---vezenozo.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/nadunovexomonononilomiv.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f98a41fd4---47448685331.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/kipafivagubomezirutogimel.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/dodokujerobufafu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/908e54162518fb1a35335c0b45227dac/vitonifeganususifixeba.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2df610139bb24f03766efe60ab12eeab/wovotibugaxowipokik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 17812 bytes
SHA-256: 8b2c91590a203d0f72760f4254b026847eb75a26169a3ae4faedced58f982229
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 11108 bytes
SHA-256: 8970535f0fc57870b3ec236c8d19bca093338c89c9256a455e31a9490593eeda

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