Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7d47a966be27da…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 19:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fb25d85e23736a08f2e0cb65cfbd547 SHA-1: 0496e2080c85247ea8fb6a401a6f22675016ba86 SHA-256: bd7d47a966be27da2ca1305f6278c1bbe5c9af63c1c89a1395a2639e36798502
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The primary attack pattern involves directing users to external resources via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://asi-filter.pl/files/file/vanasebexedipidatonimadap.pdf In PDF document text
    • http://studiomalpocher.it/userfiles/files/dusurapanejetuwo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/dasukevep.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/witala.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/zezubezuv.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/51018d01ebf2a42f3f91c10943711786/17075798393.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/wapenafedutuw.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce432188a5---pepekujetenevulod.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16109218532290---zideniganok.pdfIn PDF document text
    • http://rhondachem.com/d/files/gurokuxezuxinomubibufix.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92b6ae88e---7470202648.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fda9337b3f8c7a64e637d08e826f4c77/witanarijagugumemupus.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210730_035535.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/32091628821.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c91bf38a---silitovu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d23ec6b0---22056276007.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/matopotilosozobeja.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/07ac3ee04495b0f0beba5c2119ef8ba7/ximuginidenudatewijul.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/70028917311.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/89898256234.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/seseze.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hgbpb6najd78ufbkhtge2ar4c1/suvarigepaborej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+two+pints+a+quartPDF 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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 10352 bytes
SHA-256: 6c9027b9325fcb7b85ff87dd54ae0ba56a5fef5a27344ac6e19c3fc84c26f9e6
font_02_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 16936 bytes
SHA-256: 41308290e21945b380134076a83e38dcec9f97c6b0fddd99de1b0271edebd3f6

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