Malicious PDF — malware analysis report

Static analysis result for SHA-256 7830e9f91e042a5c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-22 16:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5d4eb15d2ada51242875825c45bd3ddb SHA-1: 0d67b13a409b9517de226b59dd043611df4eb33b SHA-256: 7830e9f91e042a5cdf797cb7a864d5e50b2909be02b69d79561b051c9d38bfe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947b9a8d32e---talibisinekolugi.pdf In PDF document text
    • http://gfb.it/upload/fck/file/49040548197.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d8299fc7bfa---worowilowifimevituzijapev.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c9e1bdd826b5887a07ec64118cba036/60253784030.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/018c2de3b5951dca6ace6a814495994d/43675528973.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f783c9a5---zetujetavibomevox.pdfIn PDF document text
    • https://cecprint.com/images/file/xedokotedapuzuviba.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/73903227435.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/jamolaximipus.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070485a37371---nalogelidogupi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0a8ff031cf121937598c004fd5cb6a4d/80093993843.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/68324320577.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zuligum.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073556017d44---mowuko.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116506025c---11349502445.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sk5l3a9jllkrnk8krunehvhn94/nivufulazitusuxuf.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701541170b9---31763008014.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab0be1bae---defuzuxazaxazokid.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609086202e7b6---regegobenulo.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/ralevodujafe.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zewaseruse.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/zixaze.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2605ad9c---1261013065.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/63618558644.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/vewebevedu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4499dd4c177afd73981c96314bc29d9e/3824812803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=beef+liver+fry+in+tamilPDF 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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10320 bytes
SHA-256: 420fa3f972867b4f91cd9a7ded6586ac2a06dd938016b89afb8837f3ecea8d20
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 17668 bytes
SHA-256: ec309e09ab888d1c831061541950208963c8335a83723b9001577f8da54bd3bc
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1