Malicious PDF — malware analysis report

Static analysis result for SHA-256 45afc572d60ff8fa…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 03:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93c1f6093b2c5500ee47e96cf5c16a72 SHA-1: c96995b833a877fff2e7d19cb5c283c793e22e32 SHA-256: 45afc572d60ff8fa9662604f76f5c3f988cbefb68fb141f7e151b75d9050c25e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files, suggests an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abwingsde.com/uploads/files/baxivinujigoraxatolaxet.pdf In PDF document text
    • https://leganordavigliana.it/uploads/file/91696419636.pdfIn PDF document text
    • http://195exim.com/datas/files/98718188165.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/27725955915.pdfIn PDF document text
    • http://bakoca.hu/files/file/fatufubozusikigorar.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/dufepi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218b1b03b74---30412653353.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/nulipaluxudidejewuji.pdfIn PDF document text
    • https://synersys.fr/contenu/file/7698876422.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/27940983357.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a63e95a5107b4246b1c6002fadeb96fb/kadopefuniboluwiwipam.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/74969873981.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcab3b6e6---64645254027.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/funadozaz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/64465bedeab7e0c47db9978f1df61787/zekinixabekibasi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/65158687308.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/xixatejitadiziti.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/46055019215.pdfIn PDF document text
    • https://people11people.com/uploads/File/vipalubaweporejeni.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/nanadeb.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/30e71d99366fb0f41a6721ee32210e63/xukixepu.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/fodametuxol.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/60b806117406de12a35ba00640ed34af/76066103032.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/tewediberiborido.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd355f2df---roveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sql+to+c%23+class+onlinePDF 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_off0000b6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 15664 bytes
SHA-256: 5d54a76a0c6e7b178b3ea78945668c5193d570f9339a64a46da1ff0b421a274d
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 9688 bytes
SHA-256: c79998e320375657a1cba2ccd59fe4433ac44b68b153a97de4d1897fa15cbe5b
font_02_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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