Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2976ca0adc3abff…

MALICIOUS

PDF

103.1 KB Created: 2021-09-13 14:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 106b1ec1c5734ee7b181b2b8662a67c4 SHA-1: 82a1f4a0c0c1eefaf8a40de2d9bc4b85a2ead40e SHA-256: e2976ca0adc3abff5761e0eacf56b2ca8a084a82961197d3f43b5037547f0118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cross-winds.in/upload/contents/images/images/kudebogitozanumuvixo.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d4bd18431f926751b96ed8a9617d94a0/53416490770.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355b67a5ca---26722342805.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/lojoranadawokiku.pdf
    • https://madeirashopping.com/userfiles/file/milakexeloravebunesi.pdf
    • http://laptopplus.be/app/webroot/files/userfiles/files/pilirabavolefadefaniluluf.pdf
    • http://chamdure.com/DATA/files/58800088955.pdf
    • http://kronospan-mofa-hungary.hu/editor_up/78514648331.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/16817550854.pdf
    • https://printjet.pl/pliki_user/File/sagimemagigotegek.pdf
    • http://sskj.pl/userfiles/file/71701869119.pdf
    • https://globalcircle.club/userfiles/file/nukatiponeligodije.pdf
    • https://leganordavigliana.com/uploads/file/22598758614.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd73989401---fovugirulurum.pdf
    • http://villa-margherita.biz/userfiles/files/tedifo.pdf
    • http://watdoenwevandaag.nl/upload/3876293764.pdf
    • http://tubietelbar.hu/uploadfile/76284105816.pdf
    • https://esz.jp/img/editor/files/nukitetamu.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/78335902069.pdf
    • http://www.ferm-matic.fr/upload/file/lufojinoburopeb.pdf
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/surediwizewijibunafejiju.pdf
    • https://emtracing.net/userfiles/file/13021858255.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/bewuzalopemuzosa.pdf
    • https://festival.bg/fckeditorfiles/file/5117388614.pdf
    • http://career-id.org/ckfinder/userfiles/files/makunuwusipagafuxawax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=trivial+in+a+sentence
    • 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_off000130d4.bin
f14ca0008ac295ea356d189e8fbc8c035f7799fbbb5983a63d9bc8dc43181171
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 18112 bytes
font_01_sfnt_off00015ff7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF7 16792 bytes
font_02_sfnt_off0001780e.bin
0c171ef0198114975fedcfb0e791b6def8df36a2665cc191e6d457e6c3471c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x1780E 10132 bytes