Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba3f488d3eefc14…

MALICIOUS

PDF

84.3 KB Created: 2021-07-20 01:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2a06cd18dac0dc15fc3c81762c45ea5 SHA-1: 3b0f467dc27178ab2ef7df328390d83bb03dd3fa SHA-256: fba3f488d3eefc146cb88bccd5fbc8caf8482fcfd4d77b20d69fdaab5e370c3e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kabelkyaobuv.sk/editor_uploads/files/wobop.pdf In PDF document text
    • http://veterina-hrib.cz/user-uploads/files/66363247298.pdfIn PDF document text
    • http://zzquansu.cn/d/files/94260648514.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/aa2c7b642ea01b16a8143e315e903ccb/joxatobojusupowinijapupu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/negabofovuxit.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/56583313364.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/60680161048.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/42807389858.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/107743452811620735269.pdfIn PDF document text
    • http://abpaluso.com/upload/file/pepawuninoweweno.pdfIn PDF document text
    • https://pmms-online.com/assets/file/40419704258.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608623c4b2cf9---vajuwajudabitugazemisiwa.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/9ugguq47hdrlho41ebdhlqr02f/65403349821.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/514622njv73ukag4m8rr83h5c1/25836844980.pdfIn PDF document text
    • https://anaksemut.com/contents//files/33238523864.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ivmhfn5mtik19a7kpqa6ip8h27/kinolurutege.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/28329025144.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/42627922137.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/44512956866.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/70728553226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bagpipes+playing+scotland+the+bravePDF 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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 17756 bytes
SHA-256: 5eae9c518bc56e614bda8f6cac0db00fe9a62e27ecda14a36856a06223a4a40f
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 11168 bytes
SHA-256: 0a6abbd173d724d46f3bc5326e1c2fe5bd8de6c894814018f60bce167e1d29c9
font_02_sfnt_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1