Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0de4a5154940cf…

MALICIOUS

PDF

85.9 KB Created: 2021-08-26 10:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ee6dd419d4e69a0271b7be7f6597571 SHA-1: 3d0e4edfc8f08cfa57d8026098c59db3268106f1 SHA-256: 8f0de4a5154940cf485fe527c2706aa2b6911b7ff5c3b6845fc195b3f5850029
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=humorous+sayings+about+getting+old PDF link annotation
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab299378cc3---84337149554.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/78733235823.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2933595cd6---febuma.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/jitifejuteju.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb487b5e314321dcc484bb3e0bcd8395/7373726587.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cb210eb12---69990480124.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/026796a34bc438c3a807f7088042b934/9175560291.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/14300908667.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d79311046abe8a68813cbd16275193c4/67448393020.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/64265019559.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bd96a882f794979d84549d08fff2f654/wagukafupaxovoje.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/rozupazikarilosupivusone.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a9068155e57c2ebf51231c4ce595a917/77054673335.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2261d0c4a5---ponifawunizofebu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/27811780512.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/gosifunab.pdfIn PDF document text
    • http://momsystem.ru/public/file/62578714318.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63584dcf51---84046653783.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40000170013.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/rulozuzagiwipobojim.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/42021503893.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/74266150603.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezuvuzubanivotuboguf.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caebfec0fb---ruledimosoxakol.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/61338739468.pdfIn PDF document text
    • 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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 17332 bytes
SHA-256: 5de5a55131132211c43e4c47f2c07870f1a96f73bb582dca60f0a1c2bcfe5e2e
font_01_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13118 10936 bytes
SHA-256: eb9f1f22506c84631188cd9f71953eb5400dad758bd11ef11dd5c9f5de6bdf57

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