Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbb27ea2f8c2573…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 03:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dabe2282b49f5785d7de1c4e8bd8a902 SHA-1: be0b409ea70fd4edb8c3380647e19cc7d1498d23 SHA-256: 5bbb27ea2f8c25732300fee8fda5317658d77fff3947b412495d3b24ffa3784a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it directs users to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t40l4d8opocnq13auhq5dum9r1/14456942347.pdf In PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/20544765135.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c984c97111---voguvezudamin.pdfIn PDF document text
    • http://xn--evdebakmhizmetleri-k0c.com/uploads/file/wupopof.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/38205702352.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jisaweselibodekiweka.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/kazupexurikawinabujugi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/74897871805.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210905_7DBE8D0B7FE75F4D.pdfIn PDF document text
    • https://limsurempat.com/contents/files/50529618830.pdfIn PDF document text
    • https://promise-land.com/upload/file/52883088879.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/62647836571.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vasalibep.pdfIn PDF document text
    • http://gapp.fr/medias/files/fijosib.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/palitawodipizukupazoluve.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/wiguxosowaxagotokabufe.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/15007233114.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/30852619558.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/55701448825.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/86648494429.pdfPDF link annotation
    • https://landtop.com/filespath/files/20210919064640.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/90674807679.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161382a30688ef---86865334267.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/75462171141.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/69486489742.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b91272b35c---voragodevabujezatujawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wonder+video+full+apkPDF link annotation
    • 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 10476 bytes
SHA-256: 7711660af03c39400b09c74f8bb870ba1f13f2f032e3ae62a1a1adf675bbabf3
font_01_sfnt_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 17364 bytes
SHA-256: 4d1812611afb54d31ec5e593a7975dece5707ae17f46a2c3fcc5bdec98fb48c0

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