Malicious PDF — malware analysis report

Static analysis result for SHA-256 a798c7f468061742…

MALICIOUS

PDF

78.8 KB Created: 2021-08-05 12:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 753ff5b425e8e7100d7bb91a4c15ef63 SHA-1: 0057d0317463b06f2d052e0f578c34527c384e57 SHA-256: a798c7f468061742fdcc092b8650aa8a592611b04bb56d66fe8d41d5db64b23a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb703dfd2---guxobixogodiv.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/a42b5eb65mte6rei7jhq601jl6/43332424590.pdf
    • https://xo-sound.ru/userfiles/file/malubipugepasubulu.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/02c55576e53c941652f114b1360a1662/tiwunojufanomunokok.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3a8b4286851dae15aa9364a98d219844/fesotafafowojaruvoxite.pdf
    • http://boschvietnam.com/files/usersfiles/files/64042589201.pdf
    • http://tsg-edinstvo.ru/userfiles/file/bekomitabobuvi.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c666bb6f5b5---regura.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aa8f4cabd---lesuzakasadumopujiv.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b582ef1a72a---66505821133.pdf
    • https://dienlanhhonganh.com/images/pic/file/93867273962.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48f3b9bae---96029352652.pdf
    • http://pogservice.ru/userfiles/file/feruvosiguranipobegu.pdf
    • http://kimandyoo.com/userfiles/file/xosipumexotaviwisaxubujew.pdf
    • http://petukmahaaaraj.com/userfiles/file/69206741097.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839aa8a1e94---87213362330.pdf
    • https://incoyun.com/calisma2/files/uploads/95301271793.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9a4702d2c660ec5a5e8d0068bb91d295/renexoburuzuwuxuvapezixis.pdf
    • http://cuacongtrinh.vn/upload/files/3821786065.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/lisim.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h3rmj08sh48aves26nc3dvc3b2/67818044800.pdf
    • http://elskup.pl/images/assets/file/lexozoxaporobov.pdf
    • https://essaidafm.com/uploads/FCK_files/file/farezikoxakelemivu.pdf
    • http://smartickgroup.com/userfiles/4904008321.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=checking+solutions+of+inequalities+worksheet
    • 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_off0000d26f.bin
4b2b8a20d3adcd3eac8d923481b54b7dfc1d49f36873834526d561e871dae935
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 11072 bytes
font_01_sfnt_off0000ebff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 16792 bytes
font_02_sfnt_off00010411.bin
27d53563d6e3e5cbf14a05fce7e47613874c2df562b5065ad8638898be94f300
pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 15756 bytes