Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8af803c93efcbc6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 11:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c768f9dfb34cb128f924701a286d308 SHA-1: b9fb7dbf32ad41e6fc4399b20a1f1e48b8b5e54a SHA-256: f8af803c93efcbc67973195196b5a26d8c7d6a85909e5de29cdfb9bda074cc81
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The PDF contains numerous external URIs, many of which are hosted on disposable domains or point to potentially compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088b22a26e2f---40554503446.pdf In PDF document text
    • http://life-worldwide.org/assets/uploads/files/nixevaba.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1e3de6bb91bdd7a8de24b01aa467322b/83560269404.pdfIn PDF document text
    • https://fallsplat.se/file/42163591869.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/26375623314.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/linakazepopaja.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e535db15d---34502409336.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/94067512170.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/20225921382.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a94880dc5dc---lutukewasan.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/wafur.pdfIn PDF document text
    • https://robertbah.si/files/file/mevekokupomatepit.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/182335f1e9a9202d0ba01703abf8fb41/gewimusonab.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f307a8be---58750628130.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/86cfc08979b59b09487940b59a073343/21767511893.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e2f3f302---52695044037.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2b6d36c3---maxizikatuxanojirafapik.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/siniwiwaruxa.pdfIn PDF document text
    • https://equinox-e.com/upload/files/kovakowalelunax.pdfIn PDF document text
    • http://lagrupacio.cat/file/5687486153.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/64192973456.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb66cf0d4---xejosujuzeseselufujazox.pdfIn PDF document text
    • http://santabruna.cl/upload/file/21304274635.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1fdceb67199f507eed37ff8126bac462/98995045599.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/eb21d09ed1a06f514ac85c00e2094055/87019040920.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/sawezegi.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/motuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=celulas+somaticas+y+germinales+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_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 17888 bytes
SHA-256: 6cda40a5e479f7f4866b7d24ea82bbc7502ea655799c69daee964e618efe355a
font_01_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 11208 bytes
SHA-256: 269ce61eb5ea967ce9697f4459b45a49bb000e0aee163088e3c9071236f6bb53
font_02_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.