Malicious PDF — malware analysis report

Static analysis result for SHA-256 5295b0d5c0fb3140…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 07:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 440bb903484888b4c1b77c086f9f6dfb SHA-1: 10be979333addafe5d93f3d2b3d9c15603c266a2 SHA-256: 5295b0d5c0fb314044bd45eedd0d5bf882adfbf7f3abbc45fe45fd9e18c5baec
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://paradisoseminatrici.it/userfiles/files/vepegiguzosoboponuwepanag.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77525d569---95177868859.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d91d4969d---96413885393.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/31732786316.pdf
    • http://naturalmis.com/userfiles/file/57802946141.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/513fa24fa7524562afe6bf77e1947ed2/jilujigimaz.pdf
    • http://mikailang.net/userfiles/file/20210505064910_363218792.pdf
    • http://kaupa.cz/userfiles/file/xaneti.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804622d046a---9080469178.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160754587ca937---11105054210.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/35415693085.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba58ed76cb---nanojifir.pdf
    • https://benqmusicworkshop.com/fupload/file/1937529729.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6abe3aeacb---97479077328.pdf
    • http://afgventuregroup.com/cfiles/file/96887030961.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee14e2a42---45876233840.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/03e4db7509ead7a38fecca461575d146/lapegobiforoxaj.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d331f49656---79488180744.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/11b017285fb6b5d489751af67ad8ed9d/jimutilifaxukakug.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9312df026---pozusaxijofejunadamijuzej.pdf
    • http://sxhk365.com/uploads/file///62785520724.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ffxiv+anima+weapons+pictures
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f3.bin
9bd940845dec0ba9ddd9bbaad720299fcb5f2409662afb42f15afea41a622d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 10924 bytes
font_01_sfnt_off0000fe57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 16792 bytes
font_02_sfnt_off00011669.bin
46091426ff90262d23442316c220621c3643e007bf071be8d4d84f73d08c4fd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 17236 bytes
font_03_sfnt_off00014329.bin
ffeb6e09df6a23b442ce61faaebc4139cbc29a4317294ce553edb599edb0a49f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 5012 bytes