Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e30f78ae85231b8…

MALICIOUS

PDF

91.0 KB Created: 2021-07-13 23:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: db66edef65ba71de72d20fcaa2c8dd27 SHA-1: ac21c1c2efebb16076c1412d318f3345782a9957 SHA-256: 0e30f78ae85231b801d18e882ba7c9c17cf59ac8bed6a79f467d1daa6d6abdc8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to potentially malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution intent. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://philabc.ru/uplcv?utm_term=formula+to+find+volume+of+circle PDF link annotation
    • https://tidurmalam.com/contents//files/wafix.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/13199546769.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/98743726581.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b076d872029---26874453206.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/778124118c28d2b331e930db63bbdb5c/33124585804.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/badatakipezopisazeriju.pdfIn PDF document text
    • https://inncredel.com/uploads/pajizadagexi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/86788722254.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/zefurubepanurom.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/dukunikikowod.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4423b873fe214632115c851eadff4ed1/25321244422.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/mojurijibe.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b70db83f---fuwosejimumafopum.pdfIn PDF document text
    • https://etadelloro.it/images/file/97640271756.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075b2f0b2ece---famuguxuj.pdfIn PDF document text
    • https://areicon.com/images/file/zijemitovuz.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/fuxexaxabule.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/hq4lu5hi5hak24r43laf1vsmd4/90785086467.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/finabuvaluxigatosum.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4ca21c70deab572a09558a5c1f8fc9dc/13727883673.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/lude2i5enr13g7ov2u6ar0hgqr/293350859.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608141b981ce6---97901749720.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/68299194980.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210629115547.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/jafanudazeb.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_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10612 bytes
SHA-256: b8ae3d48a576a7c561bff747f4de40d58135e0244990cb20f0441ccd83df4468
font_01_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 18420 bytes
SHA-256: b6a91fce0dccbddb83cda52ba91054936d0b84c98f773cf29ef6cc7f6576de3a

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