Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf5545352a3ae9f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 07:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22ff9e5341d766b16a40dc6f470408c7 SHA-1: e77c61008e81e403574489639553cbdc0fb277a1 SHA-256: ddf5545352a3ae9ffc2a83d9447468c3f286e85e29c8047e151050e5e6cc3bd3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of 'LOLBin token sequence' and embedded URLs further supports the attack pattern of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ef1459dc512293adfe67449542b4ed74/kijatedidusepaw.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/59098029993.pdf
    • http://beiwendq.com/userfiles/file/18500040531.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokibodumanikoxadivavo.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/38143820932.pdf
    • http://tdbakademi.org/userfiles/files/runajal.pdf
    • http://severstroysnab.ru/userfiles/file/47515979956.pdf
    • http://europavloeren.nl/siteimages/file/mepiwuxalaj.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba3c317d---xalunavenololaw.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/larivevados.pdf
    • http://charmingcurls.se/upload/file/durunajuvogilebug.pdf
    • https://mattress-leader.com/media/33942207001.pdf
    • https://letstravelforacause.com/miet/assets/files/moranulemofi.pdf
    • http://turinhotelcompany.com/userfiles/files/87605355576.pdf
    • https://teater77.nl/userfiles/file/niwekupebunekife.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9cc7411---3678764213.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18c393c3a---fodigaga.pdf
    • http://feg.vn/uploads/files/83709713024.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bcec5f626---58469238528.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/zosinabukew.pdf
    • http://cauthangdep24h.com/upload/files/1630134024.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/84378708768.pdf
    • http://105chers.netsociality.com/upload/files/39535760455.pdf
    • https://mattress-
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=unzip+pro+apk
    • 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_off0000c36a.bin
b27a740bb016bb1fcce3ba05fbcc740145f625c051a3f7bc062310de2df25bd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC36A 9960 bytes
font_01_sfnt_off0000d98a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
font_02_sfnt_off0000f19c.bin
4d404970be1248f6c836b3ad806a83796650aa6d9a942d1d4e81a7ff810fcf9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 17396 bytes