Malicious PDF — malware analysis report

Static analysis result for SHA-256 426a13f0b93e39d1…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 01:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b614e35ea79970e0f600e8073acdc13 SHA-1: 5c1230f6a9a609f0f1e964901373368847a773be SHA-256: 426a13f0b93e39d1f796f0ab07a649bdac95012f0ccc943afabd961bd739523e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://weddingceremoniesbybev.com/clients/72651/File/25941488398.pdf
    • http://beautybybelief.com/admin/images/file/varemax.pdf
    • http://divorcefinance.nl/uploads//file/bikasakaxuxulip.pdf
    • http://the-bom.kr/upfile/files/37272556167.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fceea5f37be5d94f3535a71f70c0b6ff/tepulidufufilugugafiju.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abf542692---kiwukalomodofarusojume.pdf
    • http://slavutich-media.ru/userfiles/file/66920712714.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d76173e4---samukezi.pdf
    • http://morethancars.nl/uploads/edytor/file/kogugunujapivizunonitaj.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/ruratulogi.pdf
    • https://pjkconstruction.ca/images/file/gopixivovirulugu.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93ea7dc1139768022842c27c96d29db2/94852902617.pdf
    • http://faradtvandor.hu/picture/userfiles/file/80263921589.pdf
    • http://amandatravel.com/userfiles/file/nugibudelasaniz.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79f4732d19---27932591737.pdf
    • http://orem.mn/uploads/files/dowaxidorijux.pdf
    • http://brkvinc.com/userfiles/file/jesularabukabuwisafel.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/falabelokazuwakotiwiw.pdf
    • http://hyundaihungthinh.com/uploads/images/files/gepokewoxofejoluz.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/88b61dc79c0ba38e4a4a0e59d57db91e/vobaxijufawo.pdf
    • http://capmar.eu/userfiles/file/75340545902.pdf
    • https://gelblighting.com/userfiles/files/57110628236.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=affinity+photo+tutorials+pdf
    • 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_off0000f063.bin
4168b33c500e96abfdb1e37d720b2cb328daa298a45dd39848b9eed4e46d43cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 10656 bytes
font_01_sfnt_off000108b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
font_02_sfnt_off000120cb.bin
fc3ced22142046b61c2e93e1cd11a383d39999d7605a1d88dfc43348de18d6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 17624 bytes