Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6adb3727b9b4b5…

MALICIOUS

PDF

87.5 KB Created: 2021-07-16 02:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba9d3fb916079bf0ddf524fc60e281b1 SHA-1: 84e019a17254fc0aea0db8e4a1e6cdac83676a20 SHA-256: fd6adb3727b9b4b5d6ca9aa068b0e9072b5005b95cd25789899b1e55dd4fcd60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the heuristics and the detection name suggest it likely attempts to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=leatherworking+trainers+wow+classic
    • https://cuisinescartier.ca/upload/editor/file/zelofeduzolakubozi.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25a44439b---zekugepazenawalujufuka.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa891056606---digemafopalo.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/8329602068.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539a4b1157---8227400465.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bde0b875f55b04e117b7cf34ac11c74b/44414307794.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jdrtfqtns4ap8nqqcnadumrb0/71383376517.pdf
    • http://daming-school.com/userfiles/file/85314958548.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4c7922ae---9531306619.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/mizidoxiwefurafexeba.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e0e2e4a4---lonekoru.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4da49e23f---41375904595.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dd6f7a756af8eae1fbef6d0dfb89558f/89102185577.pdf
    • https://kingdomofgodmn.org/userfiles/files/59342012736.pdf
    • http://zhengfutz.com/v15/Upload/file/2021521429249704.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b28d543dd9d651badf86fca32347170/84844970518.pdf
    • http://rotang.net/userfiles/file/73943154189.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/265c872cd46247c7a44938784ca59003/99125227562.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160960341db839---20885524030.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608085ca7ee82---jafudesavofeverazubawarim.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/29b2af45b56cbd663423e4d5cd2d3479/23717424932.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077019e27c68---xozatad.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ff978bed2fc33c51862b9a57bdcd1555/10371211291.pdf
    • http://bannermaul.com/userData/board/file/wifizutisalozevotunojutok.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jekavepuwutuxefipot.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_off0000f257.bin
919bcd9ad2c9346487a3850d40a88f3561f1b95379e92d15b16f09e00b6f0071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 17436 bytes
font_01_sfnt_off0001200b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
font_02_sfnt_off00013822.bin
838c4ed41e26b233041c20e9031aa3f1c12eb198a7304b7376110476d761e5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 10644 bytes

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