Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8a3f49173ef3a4…

MALICIOUS

PDF

76.7 KB Created: 2021-09-28 04:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8020c865522ddb94dbe653a166432f44 SHA-1: 4d89cafbda452ac12737260aff4faa408d73961e SHA-256: 5d8a3f49173ef3a46df2f31cb3ff0c67baa9799f25ef7b09369a9a251b47800b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://supermovi.com/userfiles/files/bogafupikiferupiferebis.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62352679470.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/dezagogoko.pdf
    • https://fetogram.ir/images/upload/files/82084308721.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9f7664b7baac9f73584d4399f2c9a82b/retij.pdf
    • http://ge-mak.com/files/35151766906.pdf
    • http://reklamavysocina.cz/UserFiles/File/pefupob.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/xizufadona.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/suremejajoteganar.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3ac83e49---79419244680.pdf
    • http://solarexperte.ch/fckeditor/editor/images/file/numisevipev.pdf
    • http://orderbestwings.com/uploads/files/72117946623.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bijozewirevexiwirubavi.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3pbhqbk8a7a2ooat6v6bndb2rm/rifudu.pdf
    • http://besteva.com/upload/files/wolejapawefasamugogobod.pdf
    • http://panova-art.com/files/file/71024263993.pdf
    • http://twinmd.ru/userfiles/file/71995685654.pdf
    • http://hgbs.de/userfiles/file/fufavezotojagafod.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/tuwelarovari.pdf
    • https://superpackeg.com/userfiles/file/xuxagowojazo.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6e669af5172bf84901d2f96c30e03862/12557908359.pdf
    • http://karat-dobremiasto.pl/userfiles/file/xurak.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/8740386558.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd646ba3d0---tudaxopetideko.pdf
    • http://interwork.sk/userfiles/file/woriwimixoba.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/79997438501.pdf
    • http://sxhk365.com/uploads/file///xalumotagimek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=como+fazer+print+no+celular+samsung+duos
    • 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_off0000c123.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC123 16792 bytes
font_01_sfnt_off0000d935.bin
73faef06264dc9d1872580998ba031654f471abe86acae29be6518bdb4a6e6c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 19344 bytes
font_02_sfnt_off00010b00.bin
d09abe1d7de69568dfe5289884c5efcd9c9b8cb2a8a7783867f03a42a0a02921
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 11156 bytes