Malicious PDF — malware analysis report

Static analysis result for SHA-256 b241ded73791abfa…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 10:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07735026bff2f925ed6859940db256e5 SHA-1: 7b9a6c24192da69f90adb1e2ececa74593b296a0 SHA-256: b241ded73791abfac57ecdad85834cb933fb0142f43c34f84fb765d5dc7dd77c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate it functions as a link farm, likely intended to lure users to phishing pages or download further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f88db654be530c21a3e5c5da3b62895f/dufesovimo.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/famuf.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/98478448982.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dumokakutebidavobituvima.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/ritixudaxevosabava.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5f4e0289cab7d662ebce0609f2b1a8a9/21596866702.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161197ef9aaed6---3590758971.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/zamixewa.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b335970cc---latiwosozinenodizamivozul.pdfIn PDF document text
    • http://wwstationery.com/files/file/47666254682.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/nurekasilemexifididiliru.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nuxigimigidipejixiris.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gifiruxebanubogijo.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81756001973.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3283f8ac4b---56970040911.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/nalalafisewomisunafip.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e96ccbe2000432eb0a52cb20d68b2841/65047298392.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da9f7d9ea5c---2874541820.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a6971e7---kelizaj.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210818052530_i18hxi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7d91b93c---geduxokefepovej.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd531af74---kidudijuwakabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=manual+do+proprietario+cbx+250+twister+2008PDF 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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 18264 bytes
SHA-256: 3b6223d47aff41d09f49d610e1c9516673d8bebdcdd80e4ce216d3aefa97ef49
font_02_sfnt_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 11512 bytes
SHA-256: 3cb244f8db113a928232c2af5de3df30c2e0112f24e569cf1aa708fe603ee20a

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