Malicious PDF — malware analysis report

Static analysis result for SHA-256 f393be85f2c1cafa…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 10:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e76e4a38f94cad4a8f016418cf3f26ab SHA-1: 9c98126c02a463cb62d6be8adf1599779db0c1d5 SHA-256: f393be85f2c1cafab5c50bc7b5d049905a736518cbb6405ffc8bb1f77ba26979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/5248f28fadf7a68ab5a00f33653f0e96/jadudaxo.pdf In PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4d1c666fa62748ead46ed76587751fc0/98273259705.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/5016813995.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e310ae7a6---liwol.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/genenepixa.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7fc30793ac2453f8e2d22db95697b4f7/gaxipe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/76548577532.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/td1fp55vgerisq39mop9ip9511/80704657570.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736725b8386---54992483985.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/88bb081d3108f8b96d291d2d694571ad/titedatojozuje.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/lc0r3c9r963u8h4e8h5rg1i0h4/73252847082.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/zozenogo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076e18e701fe---213363254.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/775184fd52e1ff8b67e57685165128b0/liburefofebirikigukowe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0403bf0242---weboputikali.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/35ebea6dbdf44ae2560b715287d2dd89/14731015197.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/3976433822.pdfIn PDF document text
    • https://efnnma.org/files/file/vubesewekus.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/44371315413.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c246e34cc61---6762517683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+many+kb+in+1+mbPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/62307646585.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 17000 bytes
SHA-256: 14131128274179dc39260bcaef01219c79c0675d715d5976028bb3d75b11eb91
font_01_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16316 bytes
SHA-256: d29d5bda1bcb1413de7747724bb3e84f6ab339cb884bd56b8cd9481358750be9
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4F 10200 bytes
SHA-256: eed317c65935147f5917566fb5553da12a1f1e7ce1d7a16a98fa9016683080db

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