Malicious PDF — malware analysis report

Static analysis result for SHA-256 513720756d2a0269…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 00:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f14a0dc79d3e03690fe2f21c471da419 SHA-1: 30695528aa93c4e8bf1d9649f3da3c0efdd9c1c5 SHA-256: 513720756d2a0269c9e6e99b8609d312d71d77420635d9a2115204678e03b48c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=ph+diagram+for+refrigeration+cycle PDF link annotation
    • https://oklogistic.lv/upload/file/73513256902.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608900ac21315---vebajenabilonepazodo.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/1195381948.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757baa810d2---64427466800.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d66e094---nopafoja.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/nosataz.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96e54c167---10086150266.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2876380d61---48518409778.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/i81fdvkq3mur4qu18fc59s4v4p/kazijazutijivibaxinu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/66464041538.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/42508469425.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/lawefumokupevugadisobi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/567afab246af8dcf1d93e77dccd4f0f1/77735903100.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81b6c8ee---nazetivodisejesub.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c47bcfec7---pepoduvebusabi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gimajomuji.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/69191424336.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/tetumofobivowese.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/82042691740.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607400900dc62---tokegu.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/zututelejixe.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/jirapigu.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/lopobutu.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/95783165932.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847de95b0d6---fogifenolulusosasefofi.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/4747967215.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_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 10872 bytes
SHA-256: 2cd52d0985aee6e50a53fbb65dd724524ac21acd62af16b79a0fd3942ed9942b
font_02_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 17008 bytes
SHA-256: 51cf59d579fa065c167b7dd33bb30590910a5f81c9e60fa403b6fa8f86cbacd1

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