Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd22e87d32d7426…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 22:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d8e546a194ee301ec567d2a3ec047d3 SHA-1: 92d42bde5b9e403e82f35f514a85992ef43112ad SHA-256: 9bd22e87d32d74262279f78faaf34669e286d53f23390da85cba17424cab884a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/20883176573.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c4896a0f359bf5f59db69861283ebdc3/95296259860.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/sapijevoliwule.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/petig.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/zedaxinidumiwako.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/votorinoxezafisiretofud.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lotug.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/37085754676.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/pivigoregigixipunifanuwi.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/sofufo.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xoluzizi.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/rejupibakugijubajeruvinil.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/69047863163.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7eb3c1d1405f26553fb0cc021a110fd2/68215980666.pdfIn PDF document text
    • http://reylab.com/userfiles/file/26216937967.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/tubedawetuzuvizozodib.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/ximodujij.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da505185d---9501115467.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109082282_46322006.pdfIn PDF document text
    • https://efnnma.org/files/file/66638059846.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/fezejofunimilebalax.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/99832828018.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/26307699639.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/diforekaxabifug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=legend+of+stickman+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51D 15220 bytes
SHA-256: 807751ac4afa55a2e8a7cbabbf83329714a2fcc19554b4c3d963ddcc5d10dfbf
font_01_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 10864 bytes
SHA-256: 6db23da6fbf884d075a9c1c3f032c46de3ba021311e226ed5b4957c0d444e543