Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13d13c695e14043…

MALICIOUS

PDF

89.7 KB Created: 2021-08-21 11:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e0fa1edd7ae550e335dfd36e099b200 SHA-1: 2744cfa494ae8c5bb566a95573d11a2a2826f1b6 SHA-256: a13d13c695e14043eb8edd6eafb16c37c2c7232d48dc31a21a323a9961ef58b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6c2efd7c---40494119001.pdf
    • http://alpha-th.com/userfiles/file/54623248226.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b613f8090767dcfe968df57acfad4c9/nolenuvosuw.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/f860hi626kvkdvm7a1meclkeer/46819372789.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0868996f1873d139d3c71428bd06008b/89048254104.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-15/20210515102001760064.pdf
    • http://irinaburmistrova.ru/files/96033197119.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q6pceppc2f4096dudd39tk1795/55058353906.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9c4534ae45947d03516ae922c021ee87/41030476520.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e9b29975---23110953749.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/324b17deb4ed7187b83fec4992d49a3e/62007970901.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16705b9b0---2266410415.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffc49b17b---82728602162.pdf
    • http://sns-russia.ru/userfiles/file/koligozan.pdf
    • http://xtra360.net/campannas/file/fabipu.pdf
    • https://gachbinhduong.com/upload/file/22056922972.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/14737903551.pdf
    • https://faktxeber.com/resimler/files/60496873134.pdf
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/22676834168.pdf
    • http://bioscipublisher.com/files/upfiles/file/32265151323.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/15515946854.pdf
    • https://gelblighting.com/userfiles/files/mifetavumosa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+make+meatloaf+in+the+ninja+foodi+grill
    • https://www.posluh.hr/ckfinder/userfiles/files/81617903861.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e387.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 16792 bytes
font_01_sfnt_off0000fb99.bin
1e4a5ab020c5e1b8aa178e71ba1da2db51b1a3867f822e56bc5a737a44a9786a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 17536 bytes
font_02_sfnt_off000128e6.bin
f161d8bfe7078a361ae17074492dc1c8e100d6db09f98c1a6b70325727346469
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 11100 bytes
font_03_sfnt_off00014251.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 16164 bytes