Malicious PDF — malware analysis report

Static analysis result for SHA-256 d064cd7c681dcdd7…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 20:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 443f08bb7e9c5dd2a88c4af12bd9bd72 SHA-1: a296cab1220786e38cfe6b3f18df526eafd4388d SHA-256: d064cd7c681dcdd71cb894782743bba1cd3ba550d291eef9c3feef5e4c09c08e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://agrilaui.com/userfiles/file/nebojerowedewofitifaxuzew.pdf In PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/80439836143.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/vijepev.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9014b2dd20---66140507512.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/dujoxisusi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/gewademuzarekapoxiga.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/34551f0fc42d0479fcc12dc3f0a55d2b/22197480596.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2f473fcc44208afed359978dff372aa5/sovusemibas.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608757843a900---53220059032.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/tuzirorusik.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/vipigojisawogelara.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/83256864373.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/gotekagewusulijesidutimam.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/jiwosewefevebikex.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/zuribofoderufet.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/12667777189.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fivolulizazabub.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3fcf02f39---60428487130.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca4138b72---75515017639.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/26d382558d33a13be1e4cbeaee610d0c/vezobu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/rogaginogojawuj.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sodofepapivujatote.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/14736906631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=concession+clauses+worksheetsPDF link annotation
    • 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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 10636 bytes
SHA-256: e9a7e4edf422a41bc28770b34ce00d04670f38bf4ec7e37457ddd8fb6407c350
font_01_sfnt_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 17004 bytes
SHA-256: 5955c4bceb020e46c0488caec2ea26058d069f38c726a5979df95b0186800dd6

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