Malicious PDF — malware analysis report

Static analysis result for SHA-256 746b2a6797872e41…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 04:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8e1368e6e3d8bdad4244aff9ad53c65 SHA-1: b7b79b6b0c4101fb14cf7662fe40e40e99b0568e SHA-256: 746b2a6797872e41d7e19d670ce4492db89ccc6f6daf6df836d075be4f869090
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of link farms on disposable hosting further indicates a malicious intent to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ae43b73bfb042bebc58f38566421f0d3/68749664194.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608076351daec---tavilixizuxunedawipu.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/86992712532.pdf
    • http://afghansolar.com/userfiles/file/43511350659.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b3120185---fumuxusumibejaxikigiso.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088980567bca---rasidatu.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899c47117e0---19195132928.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g2gqqrlp8oilsqfnbakk05im2r/39575340333.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/7e5l518o8siqpcbmccik57k4gk/71678420212.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f1f847065b9ca2a0d59fdf6b515457a8/wogujozirusarasemowimupe.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c067aab1---40767896646.pdf
    • http://asiancfea.org/userfiles/file/12429129962.pdf
    • http://thebankcardservices.com/uploads/files/jiwalofaxavuxerov.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b80268969---68297104642.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0a5c9781---safobojov.pdf
    • http://theclubburger.com/uploads/files/togek.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991179368fe---dosenekafamugal.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ee911c55251dfbfda35d9c1f1a8b4477/bogevi.pdf
    • http://badaranquehablar.com/userfiles/files/69977049403.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+champions+in+afk+arena
    • 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_off0000ed3b.bin
56d05421e1520d7063b983bb27ff325cc305f9c586f50491da24e1be7c8e500d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 17456 bytes
font_01_sfnt_off00011ab7.bin
d9f0a7b1ae3943878a0ef195cb063fcd465300bee82f340b6df8b08d8cc5ea30
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 10844 bytes
font_02_sfnt_off0001339b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 16792 bytes