Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f628de36d95d2b…

MALICIOUS

PDF

102.0 KB Created: 2021-06-30 02:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bff9bc7ff396b7527ed391b9c2079f0f SHA-1: 1466f76fb5c6787088b84b1552455320388b34cd SHA-256: 96f628de36d95d2b370acf917c5b761ae66165fe7d1ac9732c397ee8da4711aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://banglatalkies.com/dynamic-images/cms/file/voxen.pdf
    • http://dush-kz.ru/uploads/fck/file/52253422838.pdf
    • http://www.tekkoo.net/images/library/File/84756844094.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fc27140---70242606011.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608910d36cb5a---99488005393.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/59540ab3f816f0d2f865716f3abce03e/buzotefikebabalofazon.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8782f924b240cc7c0092259119780a69/26788068327.pdf
    • https://ceccarbotosani.ro/userfiles/file/15664824472.pdf
    • http://safarang.com/basefile/files/33256733274.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf345a9cb8---karasamakegurirataridiwa.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbcfa862f---11886626004.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a251fd217e8---sajoponagudodudawulugorej.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e1d981f5f---raxuwuzo.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/57612224c3d8ea98f8d65a7eb7d32fd5/82261151412.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/solafu.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4b208209311bc7bac81c97d0c4760aeb/30339021737.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/mosawoku.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10830d2c2---wutobesolizexew.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0f0792d91---37785242505.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ef1514eb0d5476021562f5b400bac8a9/kipufa.pdf
    • http://acpiindia.com/userfiles/file/8815605787.pdf
    • https://yellowstonewildlife.com/20992366591.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solid+carbon+reacts+with+oxygen+gas+to+produce+carbon+dioxide+gas
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a7c.bin
95fd6b22ce2ac2c3b6acca2c88097f24456cc8c3c91e45db77cc4faff65b0e95
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 11412 bytes
font_01_sfnt_off00014500.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 16792 bytes
font_02_sfnt_off00015d12.bin
8c2fb025d6dd04480b8fe819b05ae64b04351cf851ea9366b4aba28d511a9ec6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D12 17216 bytes