Malicious PDF — malware analysis report

Static analysis result for SHA-256 c486cc7835fa3a37…

MALICIOUS

PDF

85.2 KB Created: 2021-08-05 18:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65e8ac08e18144e790a817dc7c8af987 SHA-1: 3bd8511afda42270d01507dc77fa165367f53010 SHA-256: c486cc7835fa3a372a55b095bfbc73120e398e13c8a6913fd5e53d2c10c087d0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and disposable domains, designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware. While no scripts were directly extracted, the PDF structure and link farms are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://banghenails.com/upload/file/87008054692.pdf In PDF document text
    • http://flightshop.jp/images/blog//file/94392167898.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/dunokigexulejutosa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef5e90b442---gilipewemovezenemof.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/womowis.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99071a1a3---gojofonexexonu.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88550477230.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/98746741358.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b726b28e8---61802894012.pdfIn PDF document text
    • http://matras-devison.com/upload/file/gadukadidaxozoporisizer.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/gidasutala.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0629/680c5fbb500435e5166d9050bb45b989.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/fazoverozug.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/gutuwuxepajefezetutifodej.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40004b78d---movozagukala.pdfIn PDF document text
    • https://spacio.hk/attachment/file/73766202871.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748438d2ebf---24315575894.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/80138165989.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/kazabixomowufodewa.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/32770042874.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/poketulugisaramoni.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387d4e40f9---senadavep.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/649c69dff1ee052e5d77a18bc2e07068/guvagudigatenope.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4acb0ff8c23141cb51251d28988195d6/73017074701.pdfIn PDF document text
    • http://carszana.com/image/upload/File/75576807446.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f3c3fd659c7707d3806b02f59c95760b/13440071789.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d9s4go3cvintbi2a0etsn08nf6/gelevilupabosomapasubub.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2477679b3---lugotelenakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=limiting+reagent+problems+worksheet+answersPDF 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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 16516 bytes
SHA-256: 48c642823e6945a8499aea2c355cb850ec25ff0d6e8b63c78c0cbd6ff5f109d3
font_01_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 10972 bytes
SHA-256: ee6baab6478944e1659a6a727c2cdfa7d406bf739c43e3e6d2fc0eb032cd42be
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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