Malicious PDF — malware analysis report

Static analysis result for SHA-256 26778375d65f6282…

MALICIOUS

PDF

84.5 KB Created: 2021-07-23 04:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ee22147823dcd1b0694a513fa327edd SHA-1: 8643796ab87bbb0369f545487f27c0f08edba25e SHA-256: 26778375d65f62829a734d60d0aa2d8ad9c64235574fcc0103434ebd449b81f0
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4468c2b3d70bcc70053169a5855f61b0/tekapuli.pdf In PDF document text
    • http://asztalosweb.hu/userfiles/file/64930292685.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/904203452.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c967cfd95---61300759525.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3fd3630a67592f31e10506dc44cfab54/53972873039.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/foxupaku.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/74747294430.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d3f85d1e733fda33cb4c64ef84827631/41458752832.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7jghpbpb97g4k50pak5d9d43ad/sozixe.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/40569267848.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc87b3bf5cf---42300035260.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wevekebeg.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/05f0ae23b21bc8b861271af003cae3c8/66812216448.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2f881f0b0032b7fecb949ef9eccedb89/32439939408.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1c7b5d83---zulekudevesoxavisogapat.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/92789711031.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/35474459257.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sogazotawinelaguka.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/volanufare.pdfIn PDF document text
    • http://learningkey.org/userfiles/lokipuni.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6a12740d---39713020318.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gejoridetorafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=another+word+for+endurePDF 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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 10148 bytes
SHA-256: 9907ebab0de880b24a70a0215af80ee64e20651bcb25dd351bec25fbc1bf4332
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 16996 bytes
SHA-256: fb46faaa48b865dbac3998382efb7b1580f6c9623b297178453db373e7e9a09c
font_02_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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