Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9ecf5092ec71b7…

MALICIOUS

PDF

89.6 KB Created: 2021-06-25 19:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bed4d2f84aef46fbcd588abac60819c SHA-1: 4584eb46082fadcf4c10a36c76aaef008ad9d3e6 SHA-256: 0e9ecf5092ec71b7bdfb00e14ac8b9820f92055b7535dc1e184b3ff28ab26240
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for fraudulent purposes. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or engage them in a social engineering scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1a24d43996de1d3c9a6cd25e880568ef/lusajuwisifusewagisevil.pdf
    • http://kleiberit.ru/files/file/65112704847.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070077f9e0dc---lokumarejigutapezuvip.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160728a9a1331f---51437241554.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/76558690085.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/96dcf8953b0bb483ea3bbd4d30616ff8/mevigit.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/akq25ni9graieqhutsfenc76tu/43412365368.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/70691528720.pdf
    • http://picassogift.com/Uploadfiles/files/88472874436.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa6d9e4fc---19315339374.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/2e096c9c15115944895c1daafdcef12c/xetukidule.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608325c1cb526---21024342245.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c171b0e9e25dceffbb10e5c1b1466d86/polowexo.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dc1acc69---solok.pdf
    • http://traiteur-ribot.fr/userfiles/file/pidowujegiruz.pdf
    • https://ajitcoatings.com/uploads/2818092354.pdf
    • http://cnex.cc/images/blog//file/13955932765.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mslve1sn0nq3p349abf3d35lt5/4214989917.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/12396210271.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/jibimo.pdf
    • http://duda-tech.pl/dudatech/upload/file/xugozirukeba.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/8463319154.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4a989719032b598931bb3094ccde2d6/segebulezatajemufo.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52e0f1b3a2---mijakuxadibijidogiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tomato+has+yellow+leaves
    • 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_off0000fb6b.bin
ac6b9379c28ca010bd19454e2089eb1fc6c54c12ecc02e483d63db30e9ef9d56
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 17168 bytes
font_01_sfnt_off00012837.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 16792 bytes
font_02_sfnt_off0001404e.bin
6b8a470a857dc4de6e24d50161767d063cb43496e586df7c5ffccf388c2f09f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404E 10308 bytes