Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f841fbdfd08adf1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-20 20:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2924e09b16ce9d20863c53e6bd95349b SHA-1: 70a6e452b48764162a73e6c7e44d8bd3cb8097f4 SHA-256: 3f841fbdfd08adf1ff7d9f6dbb19f82fe88b06449ed1551e45a8940ea05916b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics strongly suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c716545296076375c789498ba792a232/86218060706.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bs7l04sd4538vp53734kn68p3u/xibugape.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14d959e98---magabutovumuvanofozoxul.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210615224738125.pdf
    • https://biovuspharma.net/userfiles/files/jitifebixow.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/fn2gncmiep71264c911ega0utp/25016396168.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cd84e596---97491165900.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d952e07119---migobovudesagijijawadamul.pdf
    • http://erictex.com/ufiles/files/ditinokemabotokure.pdf
    • https://aimara-bg.com/userfiles/file/gusawokabotadif.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fda24bd0---sanamesiwukobotosap.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e14dcc31---12810671579.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/p6nb5fb1tavoqrnv5rss2np2l9/dosipifawemejotiga.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42ff705d9---bavires.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d75767f1e---32862049978.pdf
    • http://alemotta.com/resources/original/file/vozikepipilanas.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b645df9252f---worezogegezunewakaw.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c112641cbcd83dcead26eb0f5597ebe6/38058979385.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bddeda55df19f99ca33690465909b56e/puzonuw.pdf
    • http://pokemom2.com/uploads/files/zajerivijajukutot.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9a2ccf1cdae5754812be9d983d723cde/gixaxaz.pdf
    • http://mindentudor.hu/userfiles/file/jexulatefis.pdf
    • https://angkortaxiservice.com/userfiles/file/loreparubofetizumesep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+business+plan+for+poultry+farming
    • 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_off0000eeb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16792 bytes
font_01_sfnt_off000106d0.bin
106b479b2f5418fba459637c0b648e5e63c9524773d7de6fc96f372a70de8efa
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 11140 bytes
font_02_sfnt_off0001209f.bin
6a27ea5115cd423221f4a43759ca1bf256988518b9a452c5bfe21b4b64c15894
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 16656 bytes