Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cc3d09279950c2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 01:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96c76862de32f6327736ca9c51104fe9 SHA-1: d81e98eac7adfa55594f0516333d64154a52f5fd SHA-256: 45cc3d09279950c251ed0644346c55c45612cff9f4ec065e7112e0c0c414dc2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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://cambodiadriverservice.com/userfiles/file/36508931759.pdf In PDF document text
    • http://dakdekkersindex.nl/images/uploads/89296468187.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/gokexe.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vl3lse75n0o9ue619ln1rhe6ts/93577132153.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52243913d8---kevasexunozuxubufafegis.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83448bfe1---4957216933.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/34745376836.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b73119b87---kexuji.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4644a3a47db391fd178a262bdfeec73d/95560320818.pdfIn PDF document text
    • https://teamcode.net/upload/files/duxelozoratuzifalepa.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/futofeporavusozinal.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527010344.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9f7c7bf51964013a4cc7718144186315/25598371421.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/41487692747.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/sejonirawozovirob.pdfIn PDF document text
    • http://indecomavo.pl/inc/mojaxegorujilenuj.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/mufimugumesug.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fccce6de---25662677101.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/gobevimifes.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7350c0d22f6955a921ee3cf99d49fff8/rafulexumenowixogusoku.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/gexejefu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wafunetiwumikometepenagor.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b10b982c---rimunol.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/gejoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+wheeling+diode+pdfPDF 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 10412 bytes
SHA-256: 776e7a18dda818f8ae294002bdb8ead1392fdb70fe2dbf0174eb188d133261d8
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 18336 bytes
SHA-256: ee28bb5c9db4a72fb4a1b9f9d471c353511ac7532ce47d63a2e1ea1bd0166dd3

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