Malicious PDF — malware analysis report

Static analysis result for SHA-256 662ebed4a832e7d9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 05:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3d73b0340764184caa9d79795768808 SHA-1: 8159d460b33a1ad795030d805dedff957541d3e2 SHA-256: 662ebed4a832e7d999be02f4f55b63897570badc4398e81a7dc792ba7e7e55be
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier also flagged this PDF as malicious. The primary function appears to be acting as a link farm to distribute traffic to potentially malicious or compromised destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8327

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://liveisagenix.com/ckfinder/userfiles/files/balar.pdf In PDF document text
    • https://eternalbliss.net/file/50979293828.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/sabenojobotolikijewiru.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/39d9b9e6c9f7c590a48593f75c509c89/gakogoke.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c926a1cbea1---1946875136.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/62975431993.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bazamevijeravap.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c327556628b---genogijoxivudafajuzuze.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/21501845553.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/977862dbe8cd803833d27c18b8f70a0b/fujozula.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/02865220722a0332ae226486b7f0fcaf/lurudakibamebowetuwajaxum.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db52846ae---59738918105.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd27e7644---zuranovuxigaxovetisit.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/vowadiroj.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/27333790391.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gp5kuj9prnmhdlv8p39jej7ob5/51210707205.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a47f122cd---12574083528.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/65918338737.pdfIn PDF document text
    • https://abeess.com/userfiles/file/40160071269.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/73958847676.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fufazomasuligigiverime.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160713f5ded73c---1166675538.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/43662419645.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/goq940s4je4427cr5s44i641ou/rezuwimapomofadelas.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/57152799665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hist%C3%B3ria+intelectual+do+liberalismo+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 19988 bytes
SHA-256: f7472f43b72059bf29d9da2b21056188c552f0d92243570094483617bade5d82
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 11152 bytes
SHA-256: d56b68e527301d9ac1aab8ce678d28c31de6b909fafc336f5ea15e95e4c099f1