Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dc38476426b31d…

MALICIOUS

PDF

78.0 KB Created: 2021-08-29 12:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3104b130923d7eea952f5527f3f828b SHA-1: 6a2341e6cc86d1e9c287248032c8cc0f2ace68c6 SHA-256: 70dc38476426b31dc7fc0162663ed97f78c9455d37730e1ade455a1b4d214123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160976cbb1a079---77029476082.pdf In PDF document text
    • http://billedbutikken.dk/articlefiles/file/ranunesox.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160776c60bec36---rolerudizuj.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607135cb9722c---mapeleposevewatekoligol.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/40889359181.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875ef03fd87---musopovolaz.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/16515227789.pdfIn PDF document text
    • http://artospace.com/pics/file/18899324548.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/fenojejekalavufepeso.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/93289425606.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/matibezagudafipatitavewaf.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o4rq4hvjl6r41mt25fo0evf2u1/rekozewukupogesudu.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/9007330266.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7fbd6782b60b2ee93d1578bc2b7458b1/nufoduwimevumopegadulowu.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/gurulisinazedowanizopasu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/89480472245.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429000438876675.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/70615231391.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/25ad4e4442bfe3956f9f0441365c910d/kixibarebez.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b1752c946293053faf9eb813af33a8b1/56808714141.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/217721544.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/komewil.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/dipifuturabaratotiwulu.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/81473700326.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13e08487a---sodogufutozulibaset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+legend+of+bhagat+singh+full+movie+download+720p+openloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d466f575583---wubeferoxifulofijedo.pdfIn PDF document text
    • 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_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 17432 bytes
SHA-256: 68128db136f66d109ecee08cd663d29679097b4b3b4e9ba4f7bb85468cc96b3d
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 11492 bytes
SHA-256: 29e0546a4cfe25557cfb97364054922bcd41864ec171fc0f8b78c749b0f91fb0
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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