Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b99e6b4dcd14b56…

MALICIOUS

PDF

94.4 KB Created: 2021-07-14 08:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a1791a1220c7f9d178a2c74e620bad9c SHA-1: 2abf5c450f2883a93bda527e941b03bea8f83d3c SHA-256: 8b99e6b4dcd14b56685ba975ffb06da62b9964f1270c6d3115dd4ee7efa8c577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself is indicative of a link farm, with numerous URLs embedded within the document, likely intended to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88c93e8e---dizifetiwupokigimule.pdf In PDF document text
    • http://lltsg.com/uploadfile/file///2021071222310152.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jmuq2t91tuk7u0kupn5s3cduft/83171194240.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5531e161---32251477434.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/pufeworenew.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160757107d224b---30273487240.pdfIn PDF document text
    • http://maxbrio.kr/files/files/68001867551.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/99939600802.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/66c81b3b43ac401f95af9750a35bcc62/femaref.pdfIn PDF document text
    • http://dejede.com/userfiles/file/kilegoxasawi.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wedabek.pdfIn PDF document text
    • https://kopari.hu/files/file/82548837259.pdfIn PDF document text
    • http://www.heksan.com.pl/file/86819964062.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/99497695005.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/radadejabaxulefidefevi.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6f4b137418fceb54c4ce6c78b17d2aa5/30069468721.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r0us03frssvjj2ass3r9ranini/10155140307.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/264466073.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/380716e313acbf40253062013cb93f32/xuboxiwiriv.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95f873f240---xotinuroxubaz.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/015403326cea2c42619a2cad88295027/29994442218.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894e4b2a924---68144202637.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ad8bb978---potaruvurefofobufev.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/sunixosugegu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/35066648504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=once+upon+a+time+in+deadwood+full+moviePDF 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_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 10792 bytes
SHA-256: 3c1ebf6d58e7d6496eaeb5beff9560596955f261f6913edb3c4c1e9a2b2249ee
font_02_sfnt_off00013b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B74 17820 bytes
SHA-256: 69b4122a66b343caa302ad31278ce613eabd267c3557d21ae7251f49051f14ef

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