Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c8ae7065f9b683…

MALICIOUS

PDF

124.8 KB Created: 2021-06-25 09:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b1cf9717873d48526a1a946a79263ada SHA-1: 128a00a9514da36e2672250a4eaf05f2137a7797 SHA-256: 07c8ae7065f9b683125497b1d2a7716122729630b838fbda5b902382f00d7d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=ask+i+memnu+book+in+english+pdf', are likely used to deliver phishing pages or further malware. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=ask+i+memnu+book+in+english+pdf PDF link annotation
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e44618ba3---7482336639.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef80bee38---17252978177.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeea046fb1d---fulepatulusupebawuvi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4a230b19b8d1f1a0d91b1112a2f3de36/74958401600.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39abb3686---vejododejuwubafopozis.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5b5d2rh0uskh2he9amj51cgtj6/9183883049.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/63f511c8713cfd09d01c6cec1d1794d9/pepoludamuzosafutiweb.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/74249865463.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/69119829053.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb8de046e---37762024854.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6fafd5d33e05556c7e71645e22ec8bf8/wewaxosififosulo.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/suegtnd7gf4javt8dd973life5/fibodopa.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021620817367326.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4vvjtei203nhao5o7lo8e0str2/67404816440.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/42f79a3cf4ce76b02c2085608b97a0e3/sutigopapewewomar.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c17be039---96896742334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000196c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C8 5344 bytes
SHA-256: bed583517bd2642940740b36eafb6646db43ea02e13b3373e3d0be388583f970
font_01_sfnt_off0001a8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8D4 12132 bytes
SHA-256: 15e0facdd30538c7ee0eec268bcc332e518cdbf200429bc54b4ebb1a0824f834
font_02_sfnt_off0001cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFAD 16280 bytes
SHA-256: b7643587a3065bb39b820ff241bd1f70333816ab87bfbe1e73ae85168fb2d4e7

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