Malicious PDF — malware analysis report

Static analysis result for SHA-256 d656574982323c59…

MALICIOUS

PDF

102.4 KB Created: 2021-09-03 09:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c550599b9fb80b4c73d49a5c48f9951 SHA-1: 2fa5ed295b4274413193c9bb5e74acc330fdbdda SHA-256: d656574982323c59f8f7d8ec54ae6667efcba6a9a57471be8b284c406afcd7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://seerupit.dk/assens/file/letaniwigetiwafevij.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d3129837e---4128394146.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/6722569876.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mojotugi.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/48699286220.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/mijiviguduzife.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/67509595170.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/80373987875.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/430bfa63b883454183f5a0ae4eff3947/38578086351.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/dugobowolebarub.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c436d058cb6---89520963687.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e9c7c94f5f9de89843dad9fc4edda83d/jemexipag.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/jugegawugenisatisujuvos.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/bexoxoni.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/94586947906.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/verusi.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/sagatexu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/6568956628.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608987773627c---xixun.pdfIn PDF document text
    • https://ysh.my/userfiles/file/tasuwawovuvu.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/numevadobazobof.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/48980551370.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/27614155548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hiperemesis+gravidica+pdf+medigraphicPDF 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_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8E 20440 bytes
SHA-256: a90a6cbf08118311c65642c307ceb4fabe417ce8d5a01e006121331d248c1c13
font_02_sfnt_off0001736b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1736B 10756 bytes
SHA-256: 872b15330b91d902c43144828f26e8680270fe941394bc30e341c74c8a56e1f4