Malicious PDF — malware analysis report

Static analysis result for SHA-256 453d857ab360033c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 23:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b70f5223bb504f30d03f92cce92a3ac SHA-1: 301c40f8f880affd67205d0c0f6fc3ab7fe17f12 SHA-256: 453d857ab360033c2e3d97553887fced0ab214f0ae8a428a41429682f04ebda9
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, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The primary function seems to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pikhospital.com/ck_uploads/uploads/files/dasowibozikegabu.pdf
    • http://www.drivingschool-brno.cz/files/files/87687763490.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613260dbc682b---vuvefol.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/posenivanuju.pdf
    • http://trunglam.vn/uploads/userfiles/file/sebubaj.pdf
    • https://alwaysthesame.pt/site/upload/file/94750736976.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/dakagodufasidanuwowutedi.pdf
    • http://telek-trans.hu/editor_up/41475687981.pdf
    • http://geodeslaboratori.eu/userfiles/files/kidefusuxaged.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383578ca955---30372828329.pdf
    • http://cochemical.com/upload/files/fozojipaloxowenujoduzesa.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/46194829448.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0572dc7a7---buwonufebepusesawapo.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/23810073890.pdf
    • http://bafiti.com/sklep/userfiles/file/27571789841.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/pifipozawitem.pdf
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vorivawokanefodonafanafak.pdf
    • https://myparrotfood.com/user_files/files/tijisenufaxabaw.pdf
    • http://shopphutungmayphat.com/upload/img/files/rezatuferipon.pdf
    • http://dh-life.com/ckfinder/userfiles/files/688649219.pdf
    • https://masihpt1.com/contents/files/xorobalifigezokudebide.pdf
    • http://www.florentmaussion.net/userfiles/File/85924141834.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/96486476928.pdf
    • http://spec-so.ru/sites/default/files/file/93807508150.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136677fe6bfc---58152461390.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ghost+world+comic+pdf
    • 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_off0000e770.bin
4510ab0e7ed7c20903f7e7e13b8ffd79c546fde6271637dd42c4001f01728ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 18552 bytes
font_01_sfnt_off00011786.bin
f1cc0f7f43b69d8b074c53b69ecc0c53dbf57669e51985d4806b574dd3ed8aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10612 bytes
font_02_sfnt_off00012fd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 16792 bytes