Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f3a1f2ff7822b3…

MALICIOUS

PDF

91.8 KB Created: 2021-08-10 23:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dcb3731e08a8e5d6e5a7b410ea86439c SHA-1: ab1ae30836bf60a09d849dbe61ea93e5f0673d96 SHA-256: 82f3a1f2ff7822b3b725d6a333ce59f7b866458fdf337ce2a4f47471801188f6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://drafthe.ru/uplcv?utm_term=witcher+3+performance+mode+ps5 PDF link annotation
    • http://szpitalstrzelin.pl/userfiles/files/xuselazedosibiwukafamowu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/63181248382.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7cd36b972---kijegavemiziravu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/rixipewefa.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bugare.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wopoleva.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/3662420524.pdfIn PDF document text
    • https://actorconseil.com/files/file/febamubuwero.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d2858f1e54f5665c947b4150b2ce784c/16779732820.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/vifojulak.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5db0928a438db7c7c0453e30390bb42b/14794663984.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8aff73000fe31e6bfc5146182d707051/jaxazo.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-19-11-01-35-tlgaPxWs.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16092c025dacd1---dulorujolas.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/64193632670.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b100e6ac6---lofagefoxitejuvubusiv.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf0425cf3---miwotubizimobekubizika.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/79501943466.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/wunesox.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6bce3413---powim.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/28851454165.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d6e11cae3921c481394542c7b74504cf/vetemeneda.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/73ef36a3d2458f4af1bcb8386a6f2f55/38638333182.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bf690abf---luxekoxobotoxudifusuk.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/dekijonajulibipizafow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9758370042---5472224717.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/35077310780.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 18424 bytes
SHA-256: 11fde032044500643f6fbf2b9bbf21da936a2ef3227e25fe79ed0c0873738cc2
font_01_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14780 11136 bytes
SHA-256: bd851cef61f3f421dfc9cc89676f1e0c0885122b66b649f369dd49bfdf75a496

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