Malicious PDF — malware analysis report

Static analysis result for SHA-256 f090438b91377365…

MALICIOUS

PDF

100.3 KB Created: 2021-06-26 17:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5aa5cdcb26e7efbf954d5a7f37ac503c SHA-1: 2e8e9b18b4a0c2bdd018cebcb27c1c6805832c2b SHA-256: f090438b91377365252bccf0129a2eb38fc7899c2190dbf480a1e17fc37abb4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate content. No scripts were extracted, but the presence of numerous external links suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://intrigantka.ru/images/userfiles/file/99908135888.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b363740ee03---78548088792.pdf
    • http://enjoy.sk/editor_uploads/system/files/95433932579.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160863001cef9e---24909416423.pdf
    • https://alutat.com/data/file/sebilolewojufovexovusefe.pdf
    • http://worthingtonpark101.com/userimages/81430787630.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d557d3f3---varalexirefikifaxuru.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/revobadejimez.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/92381538602.pdf
    • http://rayanchem.com/d/files/bipolubidu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6f4686fcc64362695e2e1131d0813acb/kubaduv.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075366c4ac06---zeximomunefululov.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d516674536f---wevifefuler.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb06b860c---xelepewemijowifexedurogom.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1940c69b2e5b6e4d55482d79b6d84463/sapurojuwiwelirur.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7a05baed---99725312617.pdf
    • http://frangarcia.eu/upload/file/gefefisipawezi.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f2555957e3393902cb0c318a1ec6e34f/9391340039.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d399bd80e---fapuni.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28cd17dcb911c029f307cb89d937881d/keduseneverew.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1l4iasupvtlnt6bdea5icp3hu8/sebupususaxef.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077755d10ae2---dojudofetorilami.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d8ea5a923805830edb2568f7e2e5f97/jefajizudo.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f050c01d5e---52176901902.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=justice+league+dark+apokolips+war+full+movie+123movies+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114d4.bin
e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 1784 bytes
font_01_sfnt_off00011d39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 16792 bytes
font_02_sfnt_off0001354b.bin
374dbb525033ba80ec0e5c9dd44d3d4d1c6f17d4c8adf5efb635d78715933e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 19260 bytes
font_03_sfnt_off00016724.bin
bb689a755edb12c66ad44a2e646425448c19f84f46a18af2e14403c93f739f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16724 11640 bytes

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