Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd1eeb60e865546…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 04:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 788a14d2c77b426f44235774ce94ebff SHA-1: 0bd631d84eee27edfcae8e23b94009eb1238e983 SHA-256: 3dd1eeb60e8655462c850ae84f28426879fa1245036163aa0781a4ff5c1a48a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with several URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links and the nature of the PDF suggest it's used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.alapan.org/fckimages/file/nawexotufimaji.pdf In PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/77428779306.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be7f916e89---85045174719.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/sixufapamej.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a035e7adc8---kotew.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/ditevusojawuvam.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/94252003547.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/493321f14747ebba904ce5953928a036/monopivenaperixosekelow.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/89333058135.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/42435919143.pdfIn PDF document text
    • http://baove247.org/upload/files/6463245326.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210909_091334.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/rasinanedanetoperi.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/pimoravimiwaja.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/15905859442.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5mcgurtnhamc1i576djlsa0fua/25361655756.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/poxuvetowep.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/pabive.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/70844008837.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/powepitafut.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/44114445079.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0aae8aa0d---jozal.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pidefuv.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/varapopow.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/18451691250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+mortal+kombat+2021+full+movie+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 15236 bytes
SHA-256: 3f9177b16710b1ee5097058324fc457e240a855a5a06892cd43c138c3a36a138
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 11120 bytes
SHA-256: 98252f11a421de97a5f9029c4050af1e109f93537689ef27b8e4f62f95b04489

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