Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a483ab10b9944f7…

MALICIOUS

PDF

60.0 KB Created: 2021-06-21 02:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5907ad7baaf05d971505e3b442fc40 SHA-1: 13b71cbd1c7fda6cb02e9a40a27cdb0caf576155 SHA-256: 5a483ab10b9944f722497921f2728bc7b19ac1d277b9366a6f1b1869de682a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The document body, though heavily obfuscated, contains text that could be interpreted as a lure for free content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4dbe597fd---jisurisinosofajupiw.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae57747c9---wuzumogosererofep.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6cbbffe4---55731742047.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab522be650---69768101935.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/pajole.pdf
    • http://amandamaitland.com/images/file/82838346550.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f89f54de5d36523b3d83fcd1f5ea2b76/7702237548.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6780dc9b4688a19239c4c51322838390/50694385912.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ef0329e8bbd74eddb6c11c0a5d9b71e/zilugerafumiralazakajo.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a71e5cdac---vipagaguvufegagekolu.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/40d0236d56b3b1d21e44b45244accc88/81520812325.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c343ce61da3---tumikuxadiwut.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607875532529f---gebet.pdf
    • https://baohohoanglong.com/userfiles/file/kitoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+background+video+clip
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b08d.bin
85a3cacf3b939a1494f7a9d2489d8523bc905b078a33db48e40157118ceccf95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 5284 bytes
font_01_sfnt_off0000c29c.bin
497629253c678a65c5e45406b38488c9c5dd2c3c92a19d73505fa03cd26df72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 9612 bytes

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