Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c64d419cd4b570…

MALICIOUS

PDF

79.1 KB Created: 2021-09-23 09:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c8edd85ec215c51251c0e6080a730c7 SHA-1: 5ed1648e39f930775f1e8497f9da857a891b742a SHA-256: a4c64d419cd4b57061ff0ca19f417c8f11954c52f13312726b0d3d0c69369422
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains multiple links to external sites, some hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious landing pages. The presence of a 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials by mimicking multi-factor authentication prompts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/29139556526.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/fovasagiserimeboses.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/coktgatqrqi20ufpnjgdf0i57i/61351953029.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/jiritatusowivek.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/84686155876.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_7B5B592F85AE20CD.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/lifagirun.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/532d682d26e0440c4de23dab08c91cba/wopaxavewu.pdfIn PDF document text
    • http://i-physiology.ru/upload/sapemurotumitufulibuz.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/sibijazazilirasofupisuvaw.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4f7a9d4688234c1e16697b8d0fadeb69/mamalupopulivepupavavafej.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/93964582296.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/zarunotiditigev.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/12995138190.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/foponotebepoguvaguxak.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/46919174027.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/12/file/19873259786.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/lorakajexoso.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909210836150997.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/79633954271.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30493338622.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9bdd6611805c2423e2958a24b8826ccc/77630190932.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8d819c54425caead22edffea48686a2b/welutazewoki.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/gemukatewiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=recupera+password+gmail+androidPDF link annotation
    • 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_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 10992 bytes
SHA-256: 0b3dfbc93b2b24228f95bca9521613fe6f92609de025a2d9d5056e7688b9ef15
font_01_sfnt_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 17860 bytes
SHA-256: 49d47970e5925713e5baa7f12a417ca8d8edb755734d7ed81ebd21718955ac76
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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