Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a9e55fd8c79aaf…

MALICIOUS

PDF

105.6 KB Created: 2021-09-07 14:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aae22c7aed62b8eef0df59ebd95ccb31 SHA-1: 536d1c7e3be0aa2b29cbd1f64b2d0e92990610b5 SHA-256: 26a9e55fd8c79aaf1345468060b42eeeda619151dcfdeb8c35de27c49c0edd3d
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6e562e0a6dfc7c78c2ada63c089cd6b/92834567031.pdf In PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/95759510836.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2002d0d6a0a877e1a7f2498d9e6730c2/rativa.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/23999981030.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/werijogekuraxedivig.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125cffa466f2---74197616346.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8864116d6797d34c7a5e7f00ba31cdf5/gajibibegunufefuf.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/42794811221.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/36fc3f2ea8c0b46dc41020226d199dab/kitesogefomirukazawipofuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4f0c8967---wopize.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/73172293740.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/37739270866.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vjvsorhn6a0jufuh6e41cefp94/1115807806.pdfIn PDF document text
    • http://108homed.com/userfiles/files/vavosidupu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715db48ee4---bexezoriwijaz.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tekazoboraluvo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/55513046822.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/11597339256.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41bc45718---91092314541.pdfIn PDF document text
    • https://qnzar.com/files/jilapizejilaroliriwiwobud.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a660c7bb936554ee5c9bdbbf1a119e26/dakorenuludupusomulesazu.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/10359302145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=derecho+mercantil+ii+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CD 19668 bytes
SHA-256: 108ce6f576fd023a9c3db3205e367932fbb81f461d26a5a6967ca8f9debee6c5
font_01_sfnt_off0001688b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1688B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000180a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180A2 10716 bytes
SHA-256: 1b0661d78ffab82a9b669df513099b518e9db3c27689db58858a8011d5baa410

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