Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8cacbb708ae6d9…

MALICIOUS

PDF

93.2 KB Created: 2021-08-04 18:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab78a3076f10475763e0796a71770a51 SHA-1: 31f78c9b7d9590dfb8df6a0018434d5864a2db8a SHA-256: fe8cacbb708ae6d9b3e20af1e9c7c62d3eea66f1a23dcdd4b68bab1bf0a32d31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=super+smash+flash+1+unblocked+wtf PDF link annotation
    • http://a-aqua.fr/ressource/site-image/files/79963611859.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/1356442093.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nafeganoderufozego.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/43246039220.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/34113047698.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/00c7b518779e2a0c4ed6a9f1474e0c31/18423601127.pdfIn PDF document text
    • http://rotang.net/userfiles/file/29006400508.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/15125486403.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fc3919f13ae200f3d1dc79b18d411033/vudatuveju.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e0ddca92aef3dd1b349e378da105c826/xefaditoxekudosufawiki.pdfIn PDF document text
    • http://billsky.ee/files/file/68695084192.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/65892055531.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16258662111786314576.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vivivibefevapu.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/sitejuvafapezanopuxuziwos.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/juwewivemux.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160afcb0243973---lefowizepusolokopuxojo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/28622091473.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/86620412492.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/vasomuwuzakuwunukufos.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e71d3eb56---78002953304.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/25344339043.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/fuvuxaroxazokum.pdfIn PDF document text
    • http://candientuvibra.com/images/file/bevogaziditomu.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_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 11340 bytes
SHA-256: fa03afbcaf2d7565860d1ff96f48ca2090e4fb6739e824e60f6c988e95257082
font_01_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 17484 bytes
SHA-256: 6750f37ef6aac0e1938ce2c2883969938b57e03c941d660a63cf98a4b6776d2a
font_02_sfnt_off00014f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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