Malicious PDF — malware analysis report

Static analysis result for SHA-256 6436479eb8c3cbec…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 06:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7e7fd13ec75468d54874e75bd3f9a4e SHA-1: 4f39d52818411387fa4d702e619899c34a15f6db SHA-256: 6436479eb8c3cbece3f109d9245d01ec1aae99be0978ed5a0b9280238d796cbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs suggest an attempt to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0ike47a53ceihr0mt8kquuq2o8/98111442865.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087374ae56be---82104859758.pdf
    • https://stallion-international.com/userfiles/file/kojedifugajazutis.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/bht6nnvfmsvtd97si3hioddia7/xezasebas.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/kelopoxikuzukakit.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf137a8e221---48327069538.pdf
    • http://bezagsecurity.cz/userfiles/vorunurax.pdf
    • http://china-zub.ru/userfiles/file/fixesuvugajonedudup.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ac1cbb15---27462795573.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/41bq5kls9tl4315fthgej3tq8a/zozaranadepili.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/dedb0c327f25d3dd9865819262d6eaf5/punejexewan.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/alh6231q904fci42hcmiv98573/nemuduxuluw.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3d8d1704817e9a63700e6a055bfb0504/vubakiguseferubinuz.pdf
    • https://auto826.com/uploads/files/gupesejusejax.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/652a128032d20b720eab34598effe6ca/56568887366.pdf
    • http://szolnokepul.hu/userfiles/file/68412121741.pdf
    • http://tremonttemplemacon.com/clients/862779/File/butinitugenuzo.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9559af88235b8c6b42bd795f4962d77f/wufupuvonemivapogewi.pdf
    • http://fdscience.com/UPFILE/userfiles/files/46150999229.pdf
    • http://asja-doll.ru/userfiles/file/94367489914.pdf
    • http://stlukesmn.org/clients/17773/File/83748729441.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/simaberubiminototix.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/90313648113.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/vitabupetamizimagole.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccc3992a12fc30e99425a2f81c6e5aa0/6218558041.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2132f4388c---90373582263.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+santa+clause+2+full+movie+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4c.bin
ba706a0a8793af1d270b8049b6f90eff302e54fd57e24a90d39cde07615827e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 16768 bytes
font_01_sfnt_off00011903.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
font_02_sfnt_off0001311a.bin
00e4490d5abc598ecc963676e9085b79099fa5993503bd1b46d391266e2b0ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 10752 bytes