Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bef15d12d949ce…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 15:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aa99fad06243549795b9aa97cd3626b SHA-1: e3796ee907fde56001476304b4a29313d76bdef4 SHA-256: 68bef15d12d949cec31fe732b08788a99299a96ee92fbe920af039f59399def8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The numerous embedded URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself is also noted as potentially compromised.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=bloxorz+for+android
    • http://putzlappenborner.at/editor_up/gurox.pdf
    • https://khmernative-rice.com/userfiles/file/75238872183.pdf
    • http://studiochiodo.eu/userfiles/files/16139222187.pdf
    • https://chupwo.com/editor_upload/file/40449529492.pdf
    • http://pataibicaj.hu/userfiles/file/90211703747.pdf
    • https://eastmangroupllc.net/ckfinder/userfiles/files/fusuresudikodobujo.pdf
    • https://promise-land.com/upload/file/lawulamixe.pdf
    • https://mimpishiodua.com/contents/files/80115500737.pdf
    • http://almavilag.hu/files/files/pogurogisenavom.pdf
    • http://uni-soar.com/userfiles/file/55319781414.pdf
    • http://kodemari.info/data/files/loziluxijilifulibiraj.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/91958340272.pdf
    • https://arendic.cl/files/rebexadurirarebesuzajek.pdf
    • http://kystar.net/filespath/files/20210904145004.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/36878712418.pdf
    • http://purofirstli.net/userfiles/file/vodafijajomefanusasurap.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nllnv3mvlidtnvqkh45jaonvht/7126421267.pdf
    • https://gfwofficial.com/ck_imgs/files/60188335695.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96e717616---pizavu.pdf
    • https://ceramicasvillaflor.cl/UserFiles/File/21829880515.pdf
    • http://engcaphone.com/_UploadFile/Images/file/77719378794.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tiwevur.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cca84867---rodezawigafavajefulo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb08.bin
7fc7cbe78322634ff50f626425094bf11c04a386732a2a7935c60b01c2028fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 10164 bytes
font_01_sfnt_off0000d1e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 16792 bytes
font_02_sfnt_off0000e9f3.bin
05d3a436340259dd71b6c4448b4373017d5d0a0fa62c2b730643c7cd45328730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 18032 bytes

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