Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15d7468e465f8e1…

MALICIOUS

PDF

70.4 KB Created: 2021-06-30 05:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77a821ca94a37b560d752a5ac604db0b SHA-1: 499b2222ff2535f54871a8e07ee3734d343536bc SHA-256: e15d7468e465f8e18bce907611240e30e298b169e0bd3c4e73cdf0c3245c9b36
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aronabritcan.com/userfiles/file/35211722958.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c5153bb592c---41040818474.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6a8273d93e4eadadea335558913c4a7e/mufigekigeled.pdf
    • http://palami.by/images/file/jeloxupevaluxelalonurew.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d1fada7037be57f415142345d9ccc6de/korinematanodojudagip.pdf
    • https://hyosungulf.com/uploads/file/92446341680.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f60fe30dd---xivinumif.pdf
    • http://pensionpoint.cz/userfiles/files/zidibam.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4172798b56---8696048569.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01656c449---35427183256.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/nobebeteduwizidazewelezu.pdf
    • http://bio86.fr/fichiers/depoporojosexekufifusa.pdf
    • https://bamfieldrental.com/userfiles/file/42809358746.pdf
    • http://belgium-ex.com/images/blog//file/20388934119.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0g2mhp3dm4kfj2505clfl4rh52/lutogizokidokavewar.pdf
    • http://rauvuonsach.net/images/uploads/files/70274690561.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/bac9hu91khgpblqk68tv1nf1g5/xuwivubute.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cba0d654---zijololegimulip.pdf
    • https://betenenergy.com/sites/default/files/file/42910613106.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b7ce19aa---43279840052.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+got+this+feeling+today%27s+the+day
    • 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_off0000b522.bin
171671a6c232e8424b9c3c3c5b61dc3526996e2eb335d9fef4f6755ab006157a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 15484 bytes
font_01_sfnt_off0000dc79.bin
c573db8b0550f997666539f3b1104929ef9277c295533537e2849bde07959afb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 10632 bytes
font_02_sfnt_off0000f49a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 16792 bytes