Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fe63eebbad1fe6…

MALICIOUS

PDF

104.6 KB Created: 2021-09-06 07:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd37dd60654a70c516c9e0f3b0a8f0d1 SHA-1: 85f2284960aba8872603cd409193b1589c424025 SHA-256: b0fe63eebbad1fe6e71cf1079e41d18e992d62821e842e8026d4e8b06ec39b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the nature of the URLs and the heuristic firings strongly indicate a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://navigator-nsk.ru/userfiles/file/ragatanekafogaxedarofegem.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ruwuvilirijom.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e424b7355---42849308141.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608113608f300---47427259417.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098479076659---relog.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fifuvulagadodusuwapabotep.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/mvi43bkf22jrn2tcpl6qu0i9o7/18635611410.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/fiziximan.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/87530941884.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/latelidulovugatikam.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/8547770428.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vomaforadukivavulurob.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/52712092915.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/42503291505.pdfIn PDF document text
    • http://ciskmv.com/css/file/zevedapidukepiremugaku.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f7eb5cc80b832bf03db4a114757ecf3a/4922507352.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/gomusoj.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/925921312.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/2202068441.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/kawuzagevigekitiro.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/bijep.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/kefupef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=la+negation+en+francais+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 24480 bytes
SHA-256: 8ca2b8151da92fd2d6829f31c5f8539899581b41087f1cc2c3318b86305f103f
font_01_sfnt_off00014550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14550 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off00015af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF0 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00016397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAE 10708 bytes
SHA-256: 02ceb31ed262c72d3d7b1820bca9973fb7ca4c1606f7d44d98c119915fd25e57

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