Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17407c0dafd8b72…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 17:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32996549673bf2b90c8bacc35b5040bb SHA-1: abcbc590ba9e6c148d3dfb73f794093af2c4b044 SHA-256: b17407c0dafd8b7230e1fb022991c7b4cfa128ef7c24a6371ca3d6733f24f013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://jsdarvin.com/files/69041327390.pdf In PDF document text
    • http://bassonconsulting.mc/userfiles/file/83143704673.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/ludiramavojesenez.pdfIn PDF document text
    • https://ambalatender.com/upload/files/zigasibewosuf.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1322f1dc65dab7f483c9b89c128f7c23/50270094727.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/likevuxumikawobenu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334a6ef18d4---73975687597.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c14ce987---95084143368.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b602f2f1---raxagepixilivotarewutojo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/fijotobexemipovobego.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60554296553.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/32001988424.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/76166339600.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/13801675119.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///gilewabotabu.pdfIn PDF document text
    • http://standardamulet.com/files/files/fijusena.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5ad0366dc75981483e663f2c033fd0da/51151255233.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317667302c1---86299492323.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/31217539038.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/lugepaxosaninebomuxer.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/37532761779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=real+put+lockerPDF 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_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 10240 bytes
SHA-256: 7e599f0fb7405412f7d51b3ff800df516905c3097ba7b42a1f6079f644cd50eb
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 18432 bytes
SHA-256: ba92139e46855e3d6bac3a70635739c972aa5ae25ca76e06de1f318a21e31632