Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad5d5788220bca6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 06:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a7ff776a8685bdc0beea05946fb31732 SHA-1: e67b4bd765f2693ad2543300b7406c19995e7cfc SHA-256: 0ad5d5788220bca68e2529d1b3f88971d7efad24649e5b339615278fac8784b7
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 0.9917

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 https://candbco.com/ckfinder/userfiles/files/4503237141.pdf In PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/13429857083.pdfIn PDF document text
    • http://kodemari.info/data/files/zuvofa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5a813927---5473684663.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/20246921886.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/fixawarotizijugafetodi.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/13913709525.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/vufepumul.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090306095373499.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081703225448.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/nejanixiwibaguteninad.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xixutitefuzoxejesisu.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/dejiguxa.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/55737272070.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/69112696491.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/21703330288.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c63436e6593c1ae7e65e7bf4049b7c69/gasenovobizufeniwifurej.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/64319244268.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/dusufabavagudob.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612edbfc7e6a2---42042304184.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/52127216441.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wuwalatowejijovuzusa.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/widagugimovelosi.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/7937388287.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/tozovusavuvipifewirutib.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/kuzavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=deer+hunting+gif+funnyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 10212 bytes
SHA-256: 1a120caf9230601f94de707b6633be030fb78750897f95212791a990b8692d1d
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 17024 bytes
SHA-256: 9abdd3d097ef719dd76b53c21f95ed4f40b9af47d373beca22e6133e2a37f68b
font_02_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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