Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cfdd15ff342e40…

MALICIOUS

PDF

142.7 KB Created: 2021-07-21 16:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb64b5542ae5a61f42d1b12b7784c6b4 SHA-1: 6d565ed2df6b2e7e0e5e932569c67f0135afdd9e SHA-256: d4cfdd15ff342e4098cc43370f320967d21532ab4ee74951bf03423ab453316f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://akcjonariusz.com/UserFiles/file/xofoxuxufemedov.pdf In PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/36159701599.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/kekixoreniximawusajusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28952a2892---56540299531.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/xafikapawevedo.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/fiwopofop.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/371ml5vp95bg15t0cdoo96g9a1/45922017888.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/saxisowi.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16230679164463.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ohobeks55385sr0fjfpa931rf5/wosakofapa.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1c4dee4ee2d984f2257761b9f93ced1d/wafazizat.pdfIn PDF document text
    • https://fallsplat.se/file/32042534278.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/jakogufofimuvuxapenalivut.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8605383ab50565538306108fb1e9c659/85138369753.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/puginomunatute.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f775db0ff03---levejozazodubozulaw.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/jisitiwesigo.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/33949549459.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8aca59f4---tixeguxumixef.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3a258ce4---89217250585.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/tabitubez.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/528d89a71bb90039d77de91e4289023a/xazulodotazifujaxevixoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=characteristics+and+properties+of+em+wavesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2CF 16108 bytes
SHA-256: 9ea9197b6a75c7fe67a727ea228f5add925cef9a7182c4c37535d81b948c8910
font_02_sfnt_off0001d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D800 20888 bytes
SHA-256: e87c9aa06582a9ff1d91c0c5a71e3518ba9ea05c61445e5a57ec5e1a0c645669
font_03_sfnt_off0002105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2105B 11020 bytes
SHA-256: d67a46425b234535b4c9ca979b147f4ed226ff7d850f6c915453477de5d49aec

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