Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f507f18cbf09a4…

MALICIOUS

PDF

84.4 KB Created: 2021-08-17 10:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5c02eaa266049ad304c983b3dad86c8 SHA-1: 0d2169d2add7a295a24b4aafd8a0d44babca2e44 SHA-256: f3f507f18cbf09a47c3351fe702ef1533fb1a3f4fbf6ff5e1610f2652c0e326e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to link farms hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and potentially deliver a payload. The presence of multiple external URIs and link farms indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8887c9eabf---lebapowaketepuxobos.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/okdjufio8bidhilb1uo52v8rg4/rasukoniba.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/83280920509.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b9515d4ffdad0df75c0b1da1591c2263/74105570441.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/43059027023.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888774e7ee1---namigezolodugabanabinom.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/sajopotepusopebe.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/10429228516.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ff20d17c---7574621232.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/dojav.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sudijikatasutiwukonivagug.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086153453199---filojus.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/59460388302.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c8e613d928cad9b71ffb3f7255ddc0d2/38645835623.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8a21bfeb8e53d1e8886a2a5beb069e96/85670099461.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2596d471eaab2701c63e6c219ec373b1/wininajinuj.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b25585b71d87f8cf4c3d6792a77df945/90310549428.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/3896772367.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93532372278.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/72221115138.pdfIn PDF document text
    • https://stopserv.ru/files/file/97944693935.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/rudivekitewobirazedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+see+screen+time+passcodePDF 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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16996 bytes
SHA-256: c3c1a06c4229ff922294417959a7a905dea9415fab0bee58421e85005fd376e8
font_01_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 10708 bytes
SHA-256: f11a281955be965a5cfbc45ef5531d8089e5f73f9228a1b2bee9895bb2527fd8

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