Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc5e5285f66d11e…

MALICIOUS

PDF

78.3 KB Created: 2021-10-01 19:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 021dc084c34dd39753e325f0410cfbd0 SHA-1: ea6c7794a981af310ce5238699aa4ade1c54ca0b SHA-256: 0fc5e5285f66d11e2a2f633cb118b998f1db9c3d0cc17206fe70f99e38eecf93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baovethanglongmb.com/upload/files/18457039159.pdf In PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/xolezegemadije.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317215663288.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a8257c62e---babokarora.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/29787114126.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8b2d3894---nulivenokoxujizimukuz.pdfIn PDF document text
    • http://pololanna.com/user_img/files/ronawifodajewidanumuvupo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5bb5cf31484959d757f018860f2758c8/vekugefelugovupum.pdfIn PDF document text
    • https://redac.ch/upload/17204736059.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/94251726610.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/97491767998.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/88116239793.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ffc7a9e---65487031940.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/10097240606.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403ccd81204---ruterezemapofemites.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/79790977358.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wovomobipifozasodamavabo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/72354034113.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/55235801731.pdfIn PDF document text
    • http://laserinnsbruck.com/static/54571734095.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/50942588188.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615367b124f9a---10308403486.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/70689410030.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/dalol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+black+and+white+gbaPDF 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_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 20040 bytes
SHA-256: efe962b112f99f4aa46def131772d5805dc9cb3a25c580d782215faf421682de
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10868 bytes
SHA-256: 8e3208d514a3ed8e6e514e69ff052818fd864dad397279b137f0d2b392e24201
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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