Malicious PDF — malware analysis report

Static analysis result for SHA-256 3285c0d9d8165b05…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 01:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b322a1620c7a47bcd8c9c38c2a19f513 SHA-1: 896c2b38d2219182aa35c0ed17f4ff9a45cb3897 SHA-256: 3285c0d9d8165b0517b8840697ee2d74cdebe70556e77feaeb7d3dba7bdb42e6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and heuristics indicate a high likelihood of malicious intent, specifically related to link farming and potentially SEO abuse. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious URLs strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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://drafthe.ru/uplcv?utm_term=dean+cortez+mack+tactics PDF link annotation
    • http://www.s4b.nl/upload/files/88262071557.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/34142071132.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/gupat.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/zoxagibazovakujikukosego.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/35460444000.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fad9aad6---semefufumokilele.pdfIn PDF document text
    • https://n-tlg.com/files/file/18659261578.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8180434d5650228499981db53c027fb9/jezifiner.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a67d88a4b3eb238140199af8585bea17/62595017000.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/93543552708.pdfIn PDF document text
    • http://shopabrang.com/images/files/68606301888.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/mamixeb.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/bexorevafubakazarajiga.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/5014776017.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/60545069583.pdfIn PDF document text
    • https://sadex.pl/fck/file/fefukalunifaxixi.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tixutawasigekalona.pdfIn PDF document text
    • https://comfort8889.com/upload/files/tozizuresakedepizo.pdfIn PDF document text
    • http://tulga.ru/editor/files/33274469153.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/45114501250.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/93970540859.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22824470544.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/14188753347.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/taxop.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/vemij.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/nizobefefoxovibuge.pdfIn PDF document text
    • 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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 18344 bytes
SHA-256: 698ae866e8184ab15034ba845428c046fc3ca435873e73d83db22dd19d3bfb81
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 10496 bytes
SHA-256: 6db7ec2c3200763c3906ca4baf307cc8fbdb62ce02cbdef3388acc212b4782c3