Malicious PDF — malware analysis report

Static analysis result for SHA-256 2244b21e276d5725…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 22:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ea676620291052e74cda038d394ca87 SHA-1: fb3ca61e17f4392df16c2b04020e174c9f1c799c SHA-256: 2244b21e276d57258865571dac642d8ffae23f4150391d5e90534c6da1a27ddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=giant+rush+apk PDF link annotation
    • http://inphilong.com/upload/files/gejonuwuxufemulijiteboxu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145eb545885a---20840384240.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/42523755354.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/85498938103.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/3272767778.pdfIn PDF document text
    • https://almavilag.hu/files/files/78448530720.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/92722291509.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/zalajaxo.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/tikofogolovuzimozosuki.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/luzebomafej.pdfIn PDF document text
    • https://redac.ch/upload/26389170161.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/pegixusobesevutemedizul.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/kazatesizigidawijapomafu.pdfIn PDF document text
    • https://emenu.hu/editor_up/tatilujamatepoweju.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/10602102503.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/f597n4chp547gen0r6f50np2p0/85475141027.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09739a6e1---46206471782.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614047145da25---borefasijiboderelosin.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/nexigodibowujam.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/21867958759.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/pinumodagoderaxozeniz.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/zifakalibarufabimusodu.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96377647616.pdfIn PDF document text
    • https://cncunse.com/d/files/29029327253.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/76176563020.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/57300771929.pdfIn PDF document text
    • 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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 10280 bytes
SHA-256: 5ffbbcb1df60f68cb79cebfd7faad1b452217423a97341b98008cbddde756df8
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 21348 bytes
SHA-256: c0bc375352e1317ac53b7238ec96c5627f2220000b289c7e37fc7d904dc63878
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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