Malicious PDF — malware analysis report

Static analysis result for SHA-256 869a3ca2ee7b1b56…

MALICIOUS

PDF

75.9 KB Created: 2021-07-07 03:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcb3c0e3be87e76195d00b3a4bfbaa4a SHA-1: 3f1b315e5c6c949180542993ea7f4f8ecd41f226 SHA-256: 869a3ca2ee7b1b567c8a23e363b1042f1ac7982ef047f930fa90d11b94ab2f0d
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a link farm pointing to compromised CMS uploads. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c22951aee5a---16043436559.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bc30733810e7fd90fc70575ace925e4d/65909835145.pdf
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/10175119027.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f6c0967fd8c2feb8e6df0a375bee4318/zokada.pdf
    • http://malopolskiszlakwinny.pl/upload/File/xezipevesof.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ffef9d50a14055cc8b0b2563caceee24/19844199072.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f0767576---kexipuvude.pdf
    • http://orsini-blasioli.it/userfiles/files/wakebusokul.pdf
    • http://mvdeastudio.it/userfiles/files/86780762127.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/31258891076.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608eb691dae70---67799647408.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1m8fpgcikm6hjd9t3si28ksqs7/bozokufojufobajo.pdf
    • http://smclassof57.org/clients/34860/File/zosomalanetilekipore.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/fde290195a582f5a8028285ab1a670b8/62492848267.pdf
    • http://phatnang.com/media/ftp/file/55507368970.pdf
    • https://moto-trend.cz/public/files/fck/file/xuzivudipemawik.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b16fb0bbe02---99393903348.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d239bfa197e9daf7e16487caceb92b0d/46880176368.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/i8cfqsigspoi35nddio0kppl0g/79798671379.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d7d4e98ac---vozuxo.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b3b104e3b573afecdd876cfe16ad7212/45596150585.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be747c0ae10---kefanedan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=list+of+old+age+home+in+panvel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c62c.bin
fac3f27f38fdb0aa00bc29c2f0b52bdbc7a31a2e6debe962b7ff7811205d4380
pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 16196 bytes
font_01_sfnt_off0000f042.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 16792 bytes
font_02_sfnt_off00010859.bin
5f91f3fe9e95815d7d72c4a537b6eccd0dc14b5ba2cec56590ae0e3b2545df6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 10868 bytes