Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f544829da93aa6…

MALICIOUS

PDF

81.9 KB Created: 2021-08-30 06:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5724f29b32e87f92827c1d28865fadf SHA-1: b67ff1612566a10b37ba14ee2d9123d3629947fc SHA-256: 67f544829da93aa6c6bfd93a00140c0ac9d01fc2427e8f746d65b611400dcb7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://irlanc.ru/uplcv?utm_term=catcher+and+the+rye+audio PDF link annotation
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932648eea48---38374581725.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6gu5k65ilrkvo3tskol0s4rrb3/wigazidadudukazume.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/27529336805.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb35ee0e38408b798b89025b0c23ab0e/funudevezumotijiririsej.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/phqcfdkct9e3g1bna66ta2aou5/bopeganezezaper.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2142410707---mibivowezi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc3a4a628---lewutanijuridada.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5309e481bdae8cbc4b27cb04cb918ae5/47493770186.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/davivet.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bceefc105de---lotilopodijomukawofud.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/fujorofasa.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/wosuloxozu.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/novofu.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/68850001556.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fcab5288177---vovoroxunedupo.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a744c783655---gozukumeverevoruvadamudum.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/74595246192.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81820ccf8---dumegofokas.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/84680716592.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/vafadilagus.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/eda3b87b5e4bd0a5fcaf0e5b7e950af9/89549196987.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/31678408337.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/8893769338.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6834a1a1525f2f4a46c4aaf573894126/37643524152.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jufenagixuni.pdfIn PDF document text
    • https://onlinendttraining.com/files/20678724648.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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 17156 bytes
SHA-256: 1f32656278192be5d524ad8877ae3236e9f1e40fb0b1af44e344556c80e9fe16
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 10496 bytes
SHA-256: fc1beb6971a033dc1012ca1dc8cb02ee3a73210afd1282d7c5ac3df457f75511

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