Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3b094d686fff05…

MALICIOUS

PDF

67.7 KB Created: 2021-05-24 15:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f303e2f7628783d68c86772c9e67119 SHA-1: 8b940fcb8d0204460aca336b7363b27bb48178e1 SHA-256: da3b094d686fff05966081b1d5d5fcdbeaf01652f099ae157f708f813996a9af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple potentially compromised WordPress sites and other unknown hosts. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160960e55165c9---kezojasonunopadepunevap.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2209f43b99022fe4be5d6eee8bf0243d/6375671075.pdf
    • http://sjar-tech.com/uploadfile/file/%5C/2021052301135794.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc57c61fef---93549667216.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d3a5b4d2bad733da643e613795a15b3f/77651331091.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4b39d55e---biwezojipi.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/tujitawebepafe.pdf
    • http://ahcxdq.com/uploads/file/051749129804.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1b074a11ac5fb8ba6d3fc064011d4863/49573882151.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608105f60b237---24851133428.pdf
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_091157_130.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gvtkqfftu9uug7d18jb1l4hop5/53031622787.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094abf24124b---99039890142.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160766edd1668d---tesuluranuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+test+honda+civic+ecu
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8324d781738dd1aa1f239dfdfafcdd5e/74137264550.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd83.bin
d6d148327b337c903337a1ab4a1fa174f776d61523b3ce1412b2bf5424fda46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 5012 bytes
font_01_sfnt_off0000dea1.bin
253d01d00df54e939cacc9fc8d9a7700f6132669b0050cce67c06ea83197327c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 10288 bytes

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