Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc733761122f9dd…

MALICIOUS

PDF

117.8 KB Created: 2021-06-30 05:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b9a37bb4233c9b83566c9ac0570bffc SHA-1: 43e3ed8ba0ef21406c1304671306f85447cc1ef2 SHA-256: 7fc733761122f9dd6bd1a71f05976e2e3994c37c9b7b39c42bf0bfeba964375b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f9f921c74---35224819001.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/abdf94f2fea66f5e5735cb85c94ba1e6/58668300720.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kemoxadewamowazeguwefised.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d360hk0gk3qhps1oq298teg47/valutesewod.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5944ee356---soluxotebego.pdf
    • https://moolans.com/uploads/files/vijavagatenu.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afae96c672f---bexux.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/roo6rfntoubmesb7preec5km24/79667048592.pdf
    • http://tcihk.com/userfiles/gubavinasu.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160908114b8396---62523018155.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc47b8e04f---zubolosarimo.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c6f6b4149f89ef5769c37d81986ba47e/92668872111.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2da985e4e---69969126515.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/97ppelqn3r0jbm5imee52bpctl/35072969806.pdf
    • http://waypl.pl/upload/File/bubuwegavimeronibowo.pdf
    • http://accronline.com/userfiles/file/81984956292.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3c8496810---23389871788.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713715ed6c1---mozujejonuki.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160825fb2dbd79---xolareb.pdf
    • http://morecoredesign.com/images/imageUps/files/novonazizoteborolotitoj.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d322c79bb---dofifawegubefovumim.pdf
    • http://petrduchek.com/files/36569399549.pdf
    • http://anatolianlgs.com/userfiles/file/kasogijepafakufamatapako.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/550djq7en8stuh9ldkc9a464a0/wimileronapajejiwetubu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=visible+light+application+and+uses
    • 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_off00016a27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A27 16792 bytes
font_01_sfnt_off00018239.bin
fab5eb61a64bc630623bd37f3704db8f4e7a2a78d6198d698af604ed34f4aa75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18239 18020 bytes
font_02_sfnt_off0001b0ff.bin
b4083c876359c6ce476bc44e9d7824bc01d5c5c7e32a5ac9a0abc2568fbce270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0FF 10904 bytes

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