Malicious PDF — malware analysis report

Static analysis result for SHA-256 f364f8896ea118a5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 17:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffb14ffc508124e35dab52e07a529814 SHA-1: 2de565b7feeed6b90c3e4b830d53f73a335e83cf SHA-256: f364f8896ea118a5e47c73d67e56314ec8da3ed57d03c69fcb4568394ecd7bf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://someteme.com/archivos/_20210907234557.pdf In PDF document text
    • https://asesoriagade.com/app/webroot/files/files/10377717437.pdfIn PDF document text
    • https://albertscience.com/ckfinder/userfiles/files/41153219550.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/98224710613.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/rekowuwojugurabezoboguxel.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/15252984652.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/65105012323.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/ranavapeta.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/tanolisarogokonemeribi.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/wavubonopuwiwanumoxago.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/80660831657.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/50596077287.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/kajiwebufo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec290d4084---wivadobozatazeru.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/6736518320.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/ligonija.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/50274551415.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7236d380b9190e87c5038acef660143a/43824841773.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/12311465565.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/88641944841.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/lomedatiduv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614839e7a080a---fajoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=biology+11+book+pdfPDF 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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 10360 bytes
SHA-256: 9d405a0f4b17fd6eac941700d731b22beec5d730e1d03760039e32ea9a2452ce
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 16672 bytes
SHA-256: 9369fc078c6369bb9ffa91bd3f920cb5d661348be971dfb5c56152989117ab07
font_02_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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