Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5599955e9cb5ee…

MALICIOUS

PDF

79.5 KB Created: 2021-08-06 17:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f52fd94056a6dc0056149ae70df9750 SHA-1: 050421262d146a991a539a44b5c29e363aca744f SHA-256: 3a5599955e9cb5eed873a84242b69172becf1fe8414c3b8a8daf2f4678a969f8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on potentially compromised websites. This suggests an attempt to distribute malicious content or phish users through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://audit-advisers.com/userfiles/file/90064992136.pdf In PDF document text
    • https://clove7.com/userfiles/file/49355806548.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/88304658912.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3405a58e09---fumiwenuwaw.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/26600087107.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827187c1c9---20124717361.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/87935019970.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6da22169048680cc45124a4e2e89548/pavetixasidibizazapidep.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e3af18e92---renokamolabe.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/62758564413.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/51864097011.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da1a5df234c---96972315097.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bed05997---xoxak.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9f33223d643065ff494b46f39af36721/29004599549.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/17295851898.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/15615136489.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/53c723c977e3003ea6a722c58826797f/34916839409.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fede4b3b18---55480081395.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/31985910976.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/5893370834.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f4b3c169---judegolini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=serial+number+for+easeus+data+recovery+wizard+5.8.5PDF 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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 16436 bytes
SHA-256: 5abb85f5a37939be3372b7f62ad78f2e06b973253e679435e8de2ce473f2bfbb
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 11684 bytes
SHA-256: a60c4d6f1d07c92a34be0b97d3b8e35a77c8308a982812020ea6cadd69d179ec
font_02_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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