Malicious PDF — malware analysis report

Static analysis result for SHA-256 a726f22cbe46cb0b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 06:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5705eab25ebf618022cf0138128bd73 SHA-1: 7a827a008cefbbf1a52f99cb2ab49872b5b6b9f1 SHA-256: a726f22cbe46cb0b7e14959ce252e5ee05e809d1b931210ba80419f116aab255
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs, many pointing to PDF files hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to trick users into calling a phone number under a pretext of security or billing issues. No scripts were extracted, but the presence of multiple external links and the callback lure strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=wormate+io+game+download PDF link annotation
    • https://universitecentrale.net/uploads/FCK_files/file/tetanuminifo.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/lizanuvedulukubijuso.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/wilozamarotenej.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/masutenasixusijadiduwusi.pdfIn PDF document text
    • https://senegal4d.com/contents/files/24724546211.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/zewerimilimexar.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/18887957839.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/60597945199.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161440cce7b96c---jelunoraz.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/livizibozeranetesopemo.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/magejudarasalup.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/11386022876.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8d8b88152f5540c3300ca72c08bfa945/gupozogov.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xelugoselezum.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/zadazegegipibuwesisunolu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/16009113691.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/15699515987.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/gupokofuwatabedip.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/reforixusixakararazofivod.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/zegevujobegobadinupavuf.pdfIn PDF document text
    • http://exima.kr/userData/board/file/wifenijokokosebekepumel.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/viberipal.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8r7jdm9jsjb881q3r97s5qo6k7/16976964005.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/59105938823.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 10500 bytes
SHA-256: 429e8b15e6e6266212aa993c6b119e49e95a2d7c9cca90c6438317fa5bc42b4a
font_01_sfnt_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 17356 bytes
SHA-256: 9ba302a276db4bd59e73e8e83d77df2848995ac510c07f2eb2b0789801bb9fc5
font_02_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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