Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb0348aaff193d7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 14:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b90cfa17a00d86900ce2084a463a9380 SHA-1: 5ccb16273ccf0cb0d66444abbafa3885eadd6650 SHA-256: 6bb0348aaff193d736ed0c929865b7677e26dd1b217add9a8fb1c616cd80d59b
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to potentially compromised websites hosting further malicious content, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics and external URI firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://osteriailgalloelinnamorata.com/userfiles/files/237996575.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-18/20210618223259513331.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830027728f---fidesurasagepef.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e130ace9a---sepopobovuve.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b795cc88235---doxepipem.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/xezamevolufizu.pdf
    • https://xosobacninh.vn/webroot/img/files/92207120024.pdf
    • http://wojno-stal.pl/pliki/file/75522660277.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608db16641946---bijefakidirivivexel.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jl71ueeq1899e85ugp9cp39fc5/93297570861.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vodulikiruvoxakonex.pdf
    • http://emailreceptionist.net/userfiles/file/12285378078.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/76bu6j2i9aphkauo09t66m6la7/88463664275.pdf
    • https://art-gallery.mn/uploads/files/85785089818.pdf
    • http://goteneplast.se/files/images/file/20448132023.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65adb1490---92908198113.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2f043688b51716e0c20f0f45929b4820/22331967626.pdf
    • http://ubestsports.com/imager/files/20210731132843.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5bc3cea6afb1aaefec82d26d9a170727/poxawizejoni.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ef1b8d54---podifixafowidew.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/86879644895.pdf
    • http://secretinvitation.net/images/files/pexenetipamobixisaruge.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8a405862---warevizawikozavewe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=convert+pdf+to+image+pdfbox
    • 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_off0000dfb5.bin
f998c7c5dc6bf38d0b586897b1457ac89c4d3f0c85da9c58f9d8dc90f7aab082
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 17924 bytes
font_01_sfnt_off00010dd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 16792 bytes
font_02_sfnt_off000125e7.bin
23a368b80d9fc2219e1c7e70b655b7e4dae4850941918633bbf67a14f188c7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 10968 bytes