Malicious PDF — malware analysis report

Static analysis result for SHA-256 972e6fcc887ef5a3…

MALICIOUS

PDF

88.9 KB Created: 2021-07-06 14:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4523008bab44280f7f6fcee646c67625 SHA-1: 4256105a42c66dc4a12cfce736d6e51528b4863b SHA-256: 972e6fcc887ef5a33e51e64f49ea322fef8da6487bbc576b94701fd623460622
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs pointing to potentially malicious content on compromised hosts strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pn9vp0argktih8d7bjiov2gfck/jobosonaw.pdf
    • https://vannordenvastgoed.nl/userfiles/file/pesuxib.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26860a8cf---jobotusonukizupiviravu.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfb523329---javiditazeliwanuvewazunun.pdf
    • http://kfnmsz.com/upfolder/e/files/20210623170230.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/94390531644.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/85cadeb8bed7fc0ec76545d7ef27b5fd/79411843003.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094103bd633a---39937980149.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ba743b52---jekose.pdf
    • https://foreningenflex.se/anvandarbilder/173/files/82115025676.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f5e50b0e072492297c2091ab70fefaf2/11255847864.pdf
    • http://t-p-fortune.com/userfiles/file/tovewagedakoj.pdf
    • http://aftckwt.com/uploads/file/29862957420.pdf
    • https://weyergans-hcc.lv/userfiles/file/39262544052.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2a8bdaa8---19750906637.pdf
    • https://faktxeber.ru/resimler/files/27612046409.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4efab48846---famoje.pdf
    • http://www.nomorcantikjoss.com/file/regexaxoto.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f6c64a4d898fd0ceeacee342517179cb/62150134994.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/75b7c6fa24e7b2c393da4206b9971754/kemimusiwimene.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a784305136c66da798f8b04d53698ea6/14582150381.pdf
    • http://bogelaipigeon.com/upload/file/80843730859.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-17/20210517163032977786.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=two+sided+geometric+distribution
    • 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_off0000f2af.bin
b2a2985f241794409d0d0fe53c2c1c2b99a7cb051a0f7ca64a70e87667e3fa16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10792 bytes
font_01_sfnt_off00010b6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
font_02_sfnt_off0001237d.bin
380dcbb71f6eedd32ef064f9fe5f2bef2de4a0fcfc9aa87833036650699063e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 19032 bytes