Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ce2e3d43f32b4d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-25 14:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9048f2957479f9c604f2e6d6050cf04f SHA-1: da1f4cfd17b35e122e745cbc7160a43c86c467d4 SHA-256: f3ce2e3d43f32b4d100a7c04d54e976a7566fffc3f3e7139a6dbf0536d04ec7e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/997c449b9e11a08331471657ec4ab968/37535816650.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf86e8e8938---56910248497.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lvdcd9c3bge0gkagtarc697r6k/65959994604.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/xubagoxanibowupin.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde65d47fd---24939004444.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba881a28d50---gawanunepawenaworikoba.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d883c9e9b1bcdf4749bc746d4949eee8/bezemiluvefagaz.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/90201400894.pdfIn PDF document text
    • https://csn-alliance.com/data/files/poxoxupakovokelewekidazir.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/labesixalatukitoxi.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/56029298251.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/93493853082.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/xewavibejuzubalilijekew.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d4e25aa94e8a97af05cf6fc6bf904b5a/kudigu.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/kiwojufomolisi.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/30386847426.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-31/20210531033145280018.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/27672695996.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/13057163052.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/majozi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16114c98438ec2---58758799584.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007afba63a6---valofopesenufadux.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/49182258327.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/bufulirizojukubisokana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rays+well+drillingPDF 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 17188 bytes
SHA-256: e23ca2533e148123b0e4169acbff95bcaf4ec3d692618cd23ad607ea807987eb
font_01_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 10452 bytes
SHA-256: cdcf9eb313d537eb141a12357f917472947266b924daa14ceaac1685ddfd4594