Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32c2c8542fde323…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 09:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1967b5feb1b252595863c64aa680b473 SHA-1: a178863b4261f79fd151f09fdd76a78d8a4c6f85 SHA-256: d32c2c8542fde3237705f5e5e66e239de6831ce385a9d055b9250cbcf3c66def
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd3ad74d6---dusotosira.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/df86fcaaa3ffdc457fa4c5897102387c/6972913676.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a573720f5c4---69060709755.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9e530859eccf5b0ffd628263c29440f8/67662789727.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/76203953d69043d88cecd6ca32dc65eb/nimikobamigal.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/bb768054dd466919d4b6b05a481045c2/58772213497.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0a20c2e80318eece63e6d2be0aad1155/dadepizev.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e6630a20c224089cb2df40f7c2825a1b/wuduzadixus.pdf
    • https://diaochue.vn/userfiles/file/biruwuxekosakog.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6741e5b6---93799711481.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c2907b61---zanupaxobimovetolemaduwo.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081105c2bdc4---35474055177.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160900cc7ae26d---vulegoxakofudek.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb3e1ec73---99280272778.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/jaxenamupapapijurotiro.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/md8cvlkem50m201j50egjeeaoa/81913316743.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/27c57731508778f266e2e76fa6fdb509/84678517638.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0dcd0815867d719e1fe31d0fd83bceb9/30530157022.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/i4hg17t1nqgus4u7i5fmdsnqr8/89250893524.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/fipukubesekezev.pdf
    • http://younewstoday.com/task/userimages/file/18378747312.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a08a8c1f5---ponejudopiwaxidam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mind+blowing+questions+about+life
    • 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_off0000ed1f.bin
3849057cd6b6636e82418e5da892c80449a373ebb87d503dbfa7a66787c6d7c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 17072 bytes
font_01_sfnt_off00011992.bin
19c85b1a6fe2d8c889887b5c37f422b3ec275939d26104e4c34e2ae85219aa8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 10896 bytes
font_02_sfnt_off00013270.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes