Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9eb4f828a8ab3b7…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 02:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05148ac2de406314073d73324bc54b4f SHA-1: ca80dae592f3746b0571d27c2f7737de9bd0dabe SHA-256: c9eb4f828a8ab3b79739893c7c29736b274fe04a69e12e4d7d4b7a67eed2836f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://etalentlink.com/uploadfile/file///2021082519332441.pdf In PDF document text
    • https://promobryansk.ru/userfiles/files/30528740611.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/14113747121.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/iuoe6gn2fdi6cdbmdd37pjfpiq/6487562319.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/94024991848.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaefc7175---10672410914.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/sukux.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e9a91081502f0a797da2c0ac0f78c56b/94150801226.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/batik.pdfIn PDF document text
    • https://adium.ru/userfiles/file/fidilekanen.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982da716728---81383448768.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f043b23bb---dujegibagepinuzowovusid.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/feluluvumakojapegeduw.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/dikepobonogubewawomim.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cnscah5208ig1fvvqvb6qpr8f4/ruluminirusitiv.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/32fb8f90d79fb79e2617b9701306ecfa/juzuzewidumugedijogeke.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/suwupag.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/18538232267.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/36154953785.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lixusolitulopowinililivo.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/87415635783.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/mifaxu.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/xabonugoligibolotenin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wicked+game+strumming+patternPDF 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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 20228 bytes
SHA-256: ee239cca5f2ab13ab3ee67390c57d0fcdbddfdfb15fb316429f2d4661094f2d1
font_01_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 10876 bytes
SHA-256: 94c536ffd208071cbc3c19c2592dc80e5400b5f9b8a0897077f5ef9c247f41de
font_02_sfnt_off00013e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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