Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca18fc689177a257…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 00:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a69e7d8e7c3cca7c85823171af94146 SHA-1: 060646af11ac43ff037f8a5ddd06b8e84ef49c5a SHA-256: ca18fc689177a257a13e72cbce42331376e41b53b603e8e52bc50f1ead8686ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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 https://garglob.ru/uplcv?utm_term=points+of+interest+android+app PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/181c492b9245a9aac9dfe19f243856b3/29992551522.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/35921135636.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/lugebadivosifewoloz.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/kosorofusakumirozasid.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/41053265514.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f791ca34bb---84150161066.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/bigijunagezuju.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/75619810462.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/12564824460.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29d32db1c---neditugezajepef.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/fedanejuxegifevudoru.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/4098785556.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e95f4cf613784217aa9768a63d707097/92597444429.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/24394473347.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/ralip.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wafokoxazixuxadepezelumen.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210916035430.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/70914916885.pdfIn PDF document text
    • https://breedlife.com/upload/files/80058822831.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/81973828218.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/188e4dea8e4eab28bf5ff8c1cdbc53be/donikimofawatisuzuko.pdfIn PDF document text
    • http://elitk.ru/_files/38479571427.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e3fc640299bc8831edf935b6e92e4269/fojaxik.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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 10448 bytes
SHA-256: 605928e22665384e7843b91366e25a8807351254b834325ea0b39ed70fbb1749
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 17364 bytes
SHA-256: ddb6cbeedf5e3e972d628402e4252770699ede2cc6e1e50957457b956d39dd98

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