Malicious PDF — malware analysis report

Static analysis result for SHA-256 063a24fcc6c7af4b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 07:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0969a2eb7ad1053f200354e0951a172f SHA-1: 5566a6a6e02bc4a96980189b6c487d8d52475db2 SHA-256: 063a24fcc6c7af4b85fb0b298d4563235534897387b522a8aacb8a2a6a80947e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=essentials+of+toxicology+casarett+pdf PDF link annotation
    • http://stalmost.pl/userfiles/file/fejozi.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/venizolopenudijuwovedu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831959bced---11685554847.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/30263672804.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/e4dhc6a14beon3l14rm2nhe75l/pugafajigufazokarafoduten.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/razugamefofejojomirikir.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5ec96bdd9---96423195966.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/70c45b2bd72b436b840865bc67ddfda6/waxetateretuvepidewi.pdfIn PDF document text
    • http://sbcnepal.com/images/file/tenamolitosixewito.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210612055335.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/97640316144.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8c385037218902691c2adf5511c67b1f/96792674118.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f215074666a5bbbcba2fc1a25c352dc1/wemav.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gc9o63glsjdbbf74r6peg7p77s/17145331223.pdfIn PDF document text
    • http://scpt.it/userfiles/files/96646279695.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/sibavi.pdfIn PDF document text
    • http://imi.vc/upload/files/93841086441.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210821172457.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/gokofunora.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebba0e93a31b67e3a221cbc87d1c7110/renewuwawusomosaf.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fea4221b6---3028231590.pdfIn PDF document text
    • https://slide-bearing.com/d/files/49850167626.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/94306103803.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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 17656 bytes
SHA-256: 853a3fc7c328c3a4f23458e2ba8162fe54ca368e6e664ff220136601fa9f1cfe
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 10992 bytes
SHA-256: f2d734a45c0d76f4aa23c32e1d0f9b20cdb1f9b86f4f1b8a903651bea3d2dd2d
font_02_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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