Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a1270168bdbfd…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 18:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: daeabfc670ea33bb5f291c00e9099045 SHA-1: 3d1c70985a3cce00e028d92b49b119b67e3b86ed SHA-256: cb9a1270168bdbfd5079407f9b03403a58dcdb288eae03e45480488fa578c44a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tetraeng.it/userfiles/files/54298842381.pdf In PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/35411677241.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/sitefinugeki.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/mapuxinokiwewupe.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/jozamiturigefisidare.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/jebegat.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sikoxitadisunawefew.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6e601104---bidivawirinazulopapamavu.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/94405491318.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/34713782099.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/jagokigevududafevavakevum.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/44141514817.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/potumipawisasam.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210923122106.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/46665733378.pdfIn PDF document text
    • http://telecycling.info/files/file/rabalidunapokepolojepemi.pdfIn PDF document text
    • http://isvpro.com/custom/files/zajajajavixitaniraxun.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/suvazibilinejawopegumoxul.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rekorotugovume.pdfIn PDF document text
    • https://kueapem.com/contents/files/vejezile.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ff80682c---95717029557.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/90326916779.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/tonakozabavetexeronito.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bce66088e3---folipuvufixijafuf.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/9011924520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+download+pc+games+for+windows+7+32+bitPDF 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_off0000b52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52C 15968 bytes
SHA-256: ab8611eba279f45588cca6b85eab432549e5c2de0ecc74825cb7c67107de82ed
font_01_sfnt_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 11508 bytes
SHA-256: 2e22d09d7c0cb362d10fa6bd438dd634fe7e00d434b7e0ff2bbd04b6a1e280e8

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