Malicious PDF — malware analysis report

Static analysis result for SHA-256 641f8e3c0d43dd55…

MALICIOUS

PDF

83.3 KB Created: 2021-07-08 01:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b26d192353e2f2f248202c65788e3e3 SHA-1: 07d9bd3d7de1b67a83d4cdde420cb89ffec09172 SHA-256: 641f8e3c0d43dd55fc90cf7b8d09f8c781341a06aee8477dd399f6d8fffa9064
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cpp2a5l38s10h1c074sbemp433/kinewajomuje.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609826d211429---fixibusijabutiloriwuk.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/luxikebijumuvivevuxija.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/46455439048.pdf
    • http://maihome.hu/admin1/file/rujixoviro.pdf
    • http://bundoreh.com/fckeditor/files/file/libepidaxodajapabirogug.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5c4326cfa---tasenudolinuvawi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fbcp6n8v8a07ugvfbgvnb1f8d6/vokoralorixe.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb60bc3cd8---49731832634.pdf
    • https://mamo-tato.ro/userfiles/file/gutosemepimidavujebetiwuv.pdf
    • http://adamlegal.com/userfiles/file/50638627505.pdf
    • https://alperbehang.nl/userfiles/file/94163052672.pdf
    • http://ecovn.vn/uploads/news_file/xezipukimutewilipa.pdf
    • http://tubietelbar.hu/uploadfile/venawuwimufi.pdf
    • https://tideandtigers.com/ckfinder/userfiles/files/59608186824.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84fb1dbc6---55461533276.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def6212744f---pazesopula.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/70824709173.pdf
    • http://poorclarescork.ie/images/50222224601.pdf
    • http://amdind.com/userfiles/file/35807465209.pdf
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/xawifobituluxofelugozedip.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818f994eeb5---jolul.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071947f610c0---negepalirewej.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade33c55950---23541291095.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dizzy+and+sweating
    • 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_off0000e659.bin
7f4aa371f306c625a89140fdad239bd3daf3c3412f56e693b0b6b63242587f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 16360 bytes
font_01_sfnt_off00011096.bin
adc5000c5ba134e773ac422d6e582c35a4d04a8b1fdf2c763998f33f186f91e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 10420 bytes
font_02_sfnt_off00012842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12842 16792 bytes