Malicious PDF — malware analysis report

Static analysis result for SHA-256 172c744ffdb47507…

MALICIOUS

PDF

68.7 KB Created: 2021-09-01 09:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04965c27eedd35d61f6856228cb212fa SHA-1: 12505719beac0ceef79818f86daa53daa73ab8d1 SHA-256: 172c744ffdb4750772ce310fd0a12ad33ed87791e1ee73640457d921a7767204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, including WordPress upload storage, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=shellfish+and+crustaceans PDF link annotation
    • http://edelstahl-berlin.de/media/file/dapam.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/88107455057.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/10758315443.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96362708008.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/zegosuwi.pdfIn PDF document text
    • https://triosms.com/userfiles/file/8392470326.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/latizavumuvovapo.pdfIn PDF document text
    • https://medtek.vn/storage/file/25769563048.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2cadd3097---nafawu.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/55733229415.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/90312375580.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608161bd6a62e---nibuvozurijifatejomamote.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/vinerunaxilasanegekenifug.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/82799405325.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e5a9e11362a1f8637a72bb0c643c0ead/35491050146.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/dafetupedisetewijar.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/v1cdoc9p6oj4ndo67hv86ntie9/68390584441.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/nofunafefufodanijes.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210811092329.pdfIn PDF document text
    • https://phr4u.com/files/93394411906.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/89523975794.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d900e7c1---pitegad.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/506577c41bd1e6bedb38568b40b6ab26/27651259012.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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 10628 bytes
SHA-256: 2d47ce90b88ce62a3f221bbe35a7bc512799fe652ac7d19b75a9b05de3cda32d
font_01_sfnt_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 14516 bytes
SHA-256: 7103d3ca8b872376ae6db8ff42a4d03a198986b25dc74c47a7742df31865fbf4
font_02_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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