Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cead0951f8a116…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 23:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d43e0e7bd94342c2f02245b1882df9bf SHA-1: 9e8f931f7ef414daa6ae00765a395dfa11f9eb54 SHA-256: c6cead0951f8a116896b0eb1fddefaaa39d8cd4a188af278bdac1dab6d586326
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, which likely serve as lures for phishing or malware distribution. The presence of these links suggests an attempt to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=compensated+work+therapy PDF link annotation
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bb9b176bf---71296963938.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/784f8f4a9ba30a78eef685d56800a0de/zezetufe.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/89239336984.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/65051489564.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/vajezitodubomizisuxasof.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607925bc96c5c---48992409312.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/18872967604.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/vifuvuligonijisak.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7ed42b5685846b6bef295caf912ad730/58230522713.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160747a2010aa7---72481574160.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/mifedapabubivubalezem.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe2bc4f146---6881277899.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/rexarasem.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/32434892369.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/35702218948.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fa2cd0708c79242155a9d9177e5a29f2/33291369954.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/bafaxupufepil.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7cc418a6e5a6347e046167dbea9e4463/sigebogevuxumox.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/42i6c0qf8420vfmno98gesi3e2/xivajexalifapaz.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sazakuwopitov.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ce76f16d2---daxuda.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073562455d85---wusek.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/82d977d43d91a100706ccd6b781c6b33/82701877769.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0cd4bfe6---majovab.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_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 10840 bytes
SHA-256: 1c7d41f60a5cdc84466836a2c6842cd47c64dd34b3e5f2cd2ee7452cfc3fa2af
font_01_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 17284 bytes
SHA-256: 7555128af0eb9cf39471f657d41f9576286831dce4db053777c9f556d23f6b4b

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