Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76fe3e8c54b429c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 22:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7cd3280177b3f13dd227cef627de4e77 SHA-1: b03a48031e46d8878b53180c5ccfab022eaa4713 SHA-256: f76fe3e8c54b429ca5c8775ee841f8d062ad64ef3b3b33806e9e8ade884f59b9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or SEO manipulation attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/067ede7d69fc8f409ee54de9c3f02b85/30179757686.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f2dbcf2b---46806963586.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/pugivolemamekubudad.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/31fc489d956b464fd632ef995dd91a42/53968700230.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ec1954fb8a5f205478de2bfb6e36a5ba/jepomumusafozosawununi.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/24037418262.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-29/20210629120402523131.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/lebumezadekedomugumoso.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/40052490074.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/22056354884.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5b098522---vilagixepamixape.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/18b649ce4ca3fc5ef1aa3908f698c44f/79190135071.pdfIn PDF document text
    • http://prosquash.by/data/86471405345.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609611b6ae84b---nunazidisomilugugarosof.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/86095326523.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/15017408869.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/25876388829.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/voduzetaxuwowumadun.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/29776816822.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210806155559041881mpgkc6785vwo.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/12943266251.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/joditabozorolazebokej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=weldments+in+solidworks+pdfPDF 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_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 10668 bytes
SHA-256: 949d44bb989d0cc87b6e3e6d53be330ffc0ff8074e5ca940d46a76edcbc163fa
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 20912 bytes
SHA-256: 81b207a13845d69593900f44597648524ccb2c43880b772cce0b62d478e639bd
font_02_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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