Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff91c8e3320d32a…

MALICIOUS

PDF

90.7 KB Created: 2021-08-07 21:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09bfe2c88d4dfddc01feaffd4b94c08a SHA-1: 0c53c0b0b72a76f2bd9df7e1c9fc765c5d3351f9 SHA-256: eff91c8e3320d32a24a39ac54672012aaf9ae46cfbc1e7cabb731f85452e146a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://inwebjor.ru/uplcv?utm_term=positive+comparative+superlative+50+words+list PDF link annotation
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/28095a30c3ce5591b0090f56c700e74a/bemanotijirigixalesazejul.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d04875ed8---3419450471.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/65463609361.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/musovefekusoj.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ca4b7675---lixexexikowezazunofodazeb.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/bawofetagogilototiwaxe.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/diniluxoxofedizukeg.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/59826647406.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/melixojumeforot.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/wizuvokiki.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/xebilifejasupovip.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/baximibuxiseti.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c88b47d4b3f3d9b42922de72d1c63157/22753692199.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/86615899623.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160931e143f881---domikubadosutajopowem.pdfIn PDF document text
    • https://clickbox.ro/images/file/59153888148.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/7508133451.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44280255272.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/27136154393.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda137bdcda---ximunepekezi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/meroxunobivokejozebux.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zupujogiwagipefozukajumo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b822c86647---vapetamakefine.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a26cd0a4---79977413745.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16116 bytes
SHA-256: b6da4d9adf65abd5753575497ceeb02e45f4c1fed6f4c0f4cc9739e08e006eea
font_02_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 11080 bytes
SHA-256: 1eb2c4c9232e47a2659e46505e32cea720592671d33fb5121bdebc6483eca01e
font_03_sfnt_off00014536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14536 16248 bytes
SHA-256: 6c7e1b754cf38ee70ad76cb780c90d71dc4ff6fc3e14eab78a91c98fc4406452

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