Malicious PDF — malware analysis report

Static analysis result for SHA-256 3538d0d164d19a30…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 16:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b37763f93c3398df8d9c03343bd9b3ce SHA-1: 9c7682942a116a0a00d936d0f2d4bc45da41fc74 SHA-256: 3538d0d164d19a30f5b7e14daf5462d163d661e0bd8bce80b19012ac5942ac46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple suspicious URLs indicates a high likelihood of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mplpp35ibp0incnpe9eoe5cip7/gopedulanitu.pdf In PDF document text
    • http://krevue.cz/UserFiles/File/tutox.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc7e405d30---lonutojuwonere.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a680c451227---kagage.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/pemudomunu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c07aa68e---rirupi.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/kanederukavolumup.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sezadatisopitikogak.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/burigexupisexeru.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pexubuwivaded.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/jenoje.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3f4c1da492a31c8d044102fe271493c1/relozixux.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/98124222947.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/denavipejujawemofi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d8d5c4f5---5488224429.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/losetirokinotiwozatimi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/7044189103.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/69001593392.pdfIn PDF document text
    • http://builderall.info/userfiles/file/salusimotawagugosibus.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/77c1e157e2acbf4dba5725561df14b06/34813411344.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ucebcea6r1qof880r448fe21rb/zusate.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/zolabuxapewenezom.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/17901318097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=winter+sonata+my+memory+piano+sheet+music+pdfPDF 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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 11044 bytes
SHA-256: 4f1addaa86f0191c26ddfb18104a9a9011fef86c7810323b1cc6bb482490f3b3
font_01_sfnt_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 17736 bytes
SHA-256: d2cafcac76a58b2c13f3bfa3a7da1066705efbc3f3e070ea9f0921c7d47dad21