Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b3a0a38a498a77…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 00:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e80a0d166f80f643f675ad33a6ab7bbd SHA-1: 0a7194df8188e1290b818caed2be4dffdcff1ac0 SHA-256: a5b3a0a38a498a77347ce748a90bc94dde4f74d334c365793e87aadeeb2fee65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=pokemon+ruby+rom+for+android
    • http://mrs-edu.com/sribati/editor/uploadfiles/xinaruvogegudomebefurez.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd1cb25f5---kabutonoludanobekev.pdf
    • http://timnhanhonline.com/upload/files/depuzilafim.pdf
    • http://heimundsicherheit.de/userfiles/file/dufopuduw.pdf
    • http://studiotecnicopinto.it/userfiles/files/bitabilil.pdf
    • https://renault-service.com/userfiles/kokolebizu.pdf
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/dirarovugijuzejurur.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff5e6388f---mefolo.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2529c0c4---gokotaxalixoxorarir.pdf
    • http://adacu.org/userfiles/file/20210913203132.pdf
    • https://euronuts2009.ge/files/files/sesejaxi.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gonilesemudolafinulago.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/37555558249.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210919_4F0C7F826CDFE495.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/77301838371.pdf
    • http://boothbayharborshipyard.com/userfiles/file/42882187366.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613990958c924---venaragujabiguroretivape.pdf
    • http://epmachine.ru/d/files/zajujixelapoxodezu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5ee7c78e---zejaf.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/pixexufuxutabowigo.pdf
    • https://girisimhaber.com/uploads/file/52381359591.pdf
    • http://syntrend.critical.tw/upload/files/29245277216.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a7e935e1---4281791867.pdf
    • http://foto-recepty.sk/images/fotky/tikitejonixezigekakoru.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_off0000c229.bin
7fd49dc5400f7bd781f89d493b94a7c7ecf434318410364d51e777c0af924f8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 10652 bytes
font_01_sfnt_off0000da8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 16792 bytes
font_02_sfnt_off0000f29c.bin
c25762a98023a5df3b841938a4ddcce3a79147006313b909d33af701314690fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 17684 bytes