Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c9abcb3b850c17…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 12:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 876610905c5915f5e914c862d7ebb021 SHA-1: 9eda719b7919ec09ba630b1c7cb8a32108cd213b SHA-256: 59c9abcb3b850c17245fb9e53f99339109a5da23902b38f7758f3770835a2461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=fnaf+sister+location+download+apk PDF link annotation
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/11705268577.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/64628009161.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/47824464577.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c9a0aqpurli0oqs865in8ipbvf/jogunuropasefiz.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613442a52b1d5---8374088097.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/vusuzunutuvamuz.pdfIn PDF document text
    • http://annabarons.lv/files/files/dovoveneremamunum.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1947c0dda---87902621465.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nisupirumesukujewika.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2996767a1---13280936549.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kigirebopevo.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/nevatenoj.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/44964934930.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/goxafa.pdfIn PDF document text
    • https://maviet.vn/upload/files/66750246080.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/26431747183.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16138fac1196c9---82202455304.pdfIn PDF document text
    • https://ottopianos.nl/files/48907018111.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70262202823.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/37270834312.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/16949655020.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a5d0f59db758e8256d5f92012d32d80c/82446892313.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/sekisusizavibodukola.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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 10768 bytes
SHA-256: 204fc9d1e0f4f60663d65380bf24997a0f530bddadfa055a35e98a47b010c5c5
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 19612 bytes
SHA-256: ed38b1700956ae059b68565c48ed41d9bdc308a48eb4f9dc89f0f75433dd5280
font_02_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1