Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fbe12cf8a43e64…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 05:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 69bb2d5c6b7813bd647c32f2b6f8ab48 SHA-1: de260659f17f19c771d11e8657ddd858d810fc3a SHA-256: a2fbe12cf8a43e642f81d39666b983ca0bfa9e3371ff92ce8dafbfbb13d4e884
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pistant.ru/uplcv?utm_term=grown+ups+123movies PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/89576184490.pdfIn PDF document text
    • http://irths.com/upload_files/files/biwug.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/kameliseruxopot.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/31137435003.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/tumizujozajibofozet.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/66161340517.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210925102136.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/58432111427.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/70765097673.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/77568621761.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74b7c6877---welofetesotewikikosi.pdfIn PDF document text
    • https://steammining.com/userfiles/file/86155123311.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/pefudeloraritoror.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e766b9e1e4---fewipokejejoxukak.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/sagijukelowuvojijilo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/6219365887.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/wiwekikek.pdfIn PDF document text
    • http://parentini.it/userfiles/files/57979148061.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/wibojezuruxikubuneg.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/maxezuser.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152326e92293---jinufidupavokomakima.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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 18476 bytes
SHA-256: 6a4b078ac861a5d327a47af89f68b0e589754be89a60e3d79888b0bde121c99d
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 10740 bytes
SHA-256: f30fa94912e1320cdb226454d4977d27e367d771096f6d024f3f43ffca3759bb

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