Malicious PDF — malware analysis report

Static analysis result for SHA-256 338b1a9ee8db3bdc…

MALICIOUS

PDF

153.0 KB Created: 2021-07-02 16:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a6ac317aef3c55c7e8e551279b0c696 SHA-1: 32f624928061443b27187d24d5c69f114cb81dd9 SHA-256: 338b1a9ee8db3bdc513f015f7a0f892bebacc8d8ce21bef8111e2e2a5c5646b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=mmr+deficiency+immunotherapy
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/efd62d36cc6ac76a9d11382ca3abae37/vibixumewanamudinoxuk.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6a6e8200ea29b94d7329c63febc25474/46469863534.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e7d7728d---lafexujuvefi.pdf
    • http://canvangdientu.com/images/file/67918157483.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1085fbeb9cef0c4d6f1863563164b03a/67121951668.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/43425189521.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b2edc640---raxumubopuga.pdf
    • http://cheapmarkt.com/userfiles/file/pumuzorevewerut.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f539d42f02---10403077784.pdf
    • http://alexlunacoach.com/img/editor/file/93805987976.pdf
    • http://afgventuregroup.com/cfiles/file/levax.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dd97f36e6---69621660315.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fed8900af7558f8763495a0d42726fd8/migilil.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210609_022735.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9e5f816def9a7a31679af334d5bfd2ea/19944289768.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/715446fda90495a757923f829a01aec2/63734851074.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781ff4d094a---rogaj.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/snn0ipc043d1jb0cp9jfooqf0j/64947303044.pdf
    • http://krakow4you.pl/krakow/files/kutebusa.pdf
    • http://alliance-ltd.com/userfiles/15481786807.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe832b1c56---79609572550.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f2c5651326a10e44a4da2b4a2bf91e6/muriguzelolegago.pdf
    • https://ccskin.com/geektic/files/59749411923.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9168ced67---kakepulebekovuxeworev.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6093ddd43920bb11565184d242cf42f1/72710405087.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d4e567336f8ebf1109a9017b77bd35b1/13959688811.pdf
    • http://global-leasing-management.com/uf/file/47074432672.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_off0001f076.bin
1ed2739ad4c644ee1d78801af23321a1abed73ff5e16cee710052903cf094233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F076 10880 bytes
font_01_sfnt_off00020963.bin
9acba63110fa540b049e61be1044ae472a35dae4349a38b861f25fd0c180240a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20963 20008 bytes
font_02_sfnt_off00023e4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23E4A 16792 bytes

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