Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59d8819bd6a8e43…

MALICIOUS

PDF

104.7 KB Created: 2021-09-01 04:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 587f7b322191b84fd002cf8b4971d137 SHA-1: 38fc758664743cd256c427f260010d5d34b57eac SHA-256: f59d8819bd6a8e435ee71981930b9639dd5c2bd37934180ef837de38ff29ff60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further support its classification as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110d2ab0e9c4---87150990027.pdf In PDF document text
    • http://lyshiying.com/d/files/lubuxomivamopeg.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/jomiwoselenud.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781e20904ad---totozozuwetoxugug.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/pepunukujagi.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/sibozunotebufozima.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/3b768385c742b251936b0ddd5665cf9e/rexurufem.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a989967bc6---3682282994.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/72978015846.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/mevonotaxutezanewej.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lefuvojuw.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/31031829823.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fcmandgu48k3dqmt55sbislsqb/fenujekom.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/100fba62d6efafabb0e8f8f8e50b2e85/venafesixonuduza.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/xojusaxogu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/23888607301.pdfIn PDF document text
    • https://argumentua.com/i/file/mabifaletorewumuvasumu.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/talusi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc8c1c5b4---tikelinekona.pdfIn PDF document text
    • https://digireg.at/upload/78880498559.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ed758b7ffd6bb20ae5cfa3164b04f59/lerado.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bd906f68d4b---29582736118.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93f575dc65---45184391097.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d2d16eb34fcc401e9efdff9a0ac56517/vatenidemedinimurol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=square+root+of+76+simplifiedPDF 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_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14757 11092 bytes
SHA-256: 8c29db9a6da964176887a69259fff43975b0fec80a02073f55c3c7b0b3f20c3d
font_02_sfnt_off00016113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16113 19996 bytes
SHA-256: 39a474c17b38d4e95a7fcabdf91cbf9fa34c96c44bbc496016d439db18ca2e8b

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