Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c2d261d623ee14…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 05:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7796de25787ccbebbeb105eacbd6fb1c SHA-1: 74cbcb64ca2c4ec829394a99dac1b7923ef7df58 SHA-256: e0c2d261d623ee147dc5a30d8d251adda5d9f55da68a3bbc74592bc3149a8c11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=download+instagram+status+saver+apk', suggest a lure for phishing or malware downloads. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=download+instagram+status+saver+apk PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134951e715af---2698469273.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/97801990377.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/62094267649.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/zexafuvujitaguj.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/depakotemifemepu.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/31959407542.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f416ab851e---nibisi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148adff7253e---tawoweraremuv.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3a75459d2702280abae8844adb5ad93e/kokogavokowagijobivabot.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/70412766019.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/50449430170.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/82949423315.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/julipegezowudubapof.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137530425205---tomabezagirogula.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/kibazowemasalumel.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/72889559537.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/91848973310.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143059cb8b5a---mudatujolizajalofufam.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc631da4f0---gudevajozomajejek.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/53733400769.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903025144395320.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/rabavagelagojirud.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/pugixafo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143192ea57e3---51934470334.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 11080 bytes
SHA-256: a591cacba20d7de405cd07a1d1a9609af3722ebe33f5ca7d644bf647a9271e4f
font_01_sfnt_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 17668 bytes
SHA-256: 48eeb828033fa5560a91c3df8ac22edc01537bd40956d4a2f2972d7097d6fd0d

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