Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eff1fc8cf5af70…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 02:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3db13d0480ff2f1ea4ff6452047efad SHA-1: 531aed9dfb4a99f495abe2b36c92c2f5e49a7e9f SHA-256: d7eff1fc8cf5af705af758770be803891f175b46e4d50e3cf9c169f01a7d8b55
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, specifically WordPress sites, which is a common tactic for phishing or distributing further malware. The embedded URLs point to various domains, many of which are associated with compromised WordPress installations, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613222b230331---55462164682.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5134db5c---faduwipiworatividaluvabe.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/64mlm1cjji238fea473alol60d/lokuj.pdfIn PDF document text
    • https://aedwea.com/upload/foto/3971837111.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/adeb1b432b9e05e0bea624b406002681/jixepobeleduniminil.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a0171c1c3c5---ritufaj.pdfIn PDF document text
    • http://chromoink.com/updates/file/venunewaselin.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082356ca7a86---5433107438.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/janarojepido.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/86554398953.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/verilaxivubifametopu.pdfIn PDF document text
    • http://hasyo.net/files/file/42722226747.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/56437436193.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/1639114119.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/52866197797.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567b705dda---70289107300.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/18813308788.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/wogisewifemax.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/wifatesuf.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/vejedu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/66589774634.pdfIn PDF document text
    • http://vucert.vn/uploads/files/jitavupafatebuxel.pdfIn PDF document text
    • http://svx.su/ffile/file/91603886853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kitab+aqidah+tauhid+pdfPDF 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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 21096 bytes
SHA-256: b41fab65a3dc61cafb0f76e31266e113bc8d98dde6c360e198f83b538ed1e08d
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 10300 bytes
SHA-256: bc1a8983c1ab0f5816366ac409fa40f05472deea8af9791f1a7715fe5ead80ae