Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f1be7036bdf079…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 09:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88206ebad7b1e1ee2247edf3a6792ea8 SHA-1: c9ad2ad976040a15f1b5124518c6d5b47661a21c SHA-256: 27f1be7036bdf079e0c08278e8ab9113ce5e1f8ed19b4a70bb41d5b9687c065e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://onellenorzes.com/uploads/files/62007767040.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/85752016194.pdf
    • http://rilta.net/userfiles/files/bifonogutexo.pdf
    • https://okinawa4d.com/contents//files/13814800132.pdf
    • https://galerie-louise.be/userfiles/files/98285117102.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a2c011e377abcdeb70afceb844752fae/60031778016.pdf
    • http://inbiosa.eu/static/cfiles/files/50288067855.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/d8k556dddl7o45f0h3icaghr2m/rewetij.pdf
    • https://betenenergy.com/sites/default/files/file/36370173853.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/62874164380.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/vlkei9oiv5jt0p6iviqlckcp3s/6764107242.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16198935972025.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/57047494244.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e68bb1814f---figanolemakugimasar.pdf
    • http://fatename.com/uploads/files/202108221109071890.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/bijevawafor.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/62117192171931b220e1f67bab816a54/buraravofumupimifavinab.pdf
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/kosam.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/70403288432.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c73ed6b6b82---37086442784.pdf
    • http://studiopignotti.it/userfiles/files/kenupesijidone.pdf
    • http://tulga.ru/editor/files/verofavafomozesowuvuje.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/xoxedikudonu.pdf
    • https://htchninc.com/d/files/54972797053.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wkhtmltopdf+footer+on+each+page
    • 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_off0000d1ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 16792 bytes
font_01_sfnt_off0000e9e1.bin
14de8ff9c75e634e280b09ab3e5bea7aad542aaaba7f4a56eae6f81fde1548f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10892 bytes
font_02_sfnt_off000102b4.bin
a094b34409485ae4b0060659f82d7d73db7f014701a6a93892ef12fe49b12716
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 19072 bytes