Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46cf29c93a5948c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 12:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a2b8074757ae827ef61324726a4b76a SHA-1: 03bd7bf65a4ec7430d16131eac67a3e9b5f50331 SHA-256: f46cf29c93a5948c93944bb9691cfd3f19ee3b809ce648b4a86a635d27262975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination and leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=atomic+radii+of+neon+in+angstrom PDF link annotation
    • http://dungcubepgiangtrinh.com/webroot/img/files/lotonivosupamixoxotoz.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/fupefusekurizofipeboxokof.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/88901187967.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134901cc8d6f---83593752901.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/naxasoza.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9a5cb44ab8f1a6a4ce2ec6702381d08a/tusinexuwakiwiwofarebul.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pjms99vnnepqba0umpac6b9785/fiwisekidefop.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/begosik.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/paxit.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/49127046302.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/98129599620.pdfIn PDF document text
    • http://soles2walk.com/data/file/97308235783.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/lodezejamovabut.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/43034750065.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/tuperekuworuxozawatasa.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2099579348.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613c32571d085---98445337174.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913025023.pdfIn PDF document text
    • http://prestopc.it/upload/file/69976080694.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/53eb1683bb7103d87ee7d615bfda1d5e/22947687384.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/22972998944.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/77856773184.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/nijokixunex.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613502ff8ba9e---pobelilizadujexi.pdfIn PDF document text
    • 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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 18196 bytes
SHA-256: 0bd1078f59349e7475828ff935ac511a4671645c078493e21264d7eca4d6fdfd
font_01_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 10756 bytes
SHA-256: c96edd23cb58a9c2953051508f0930a955ab1b505be3d9e97479024a83d8b24f
font_02_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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