Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a82f69a15f2004…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 10:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0e5631426a78fbe1f4bb484fe98aa99 SHA-1: 18b68963a80388a2f547d23d26a0fbba74658e69 SHA-256: 82a82f69a15f2004e98a2788b61cfea23709a3a67a249ee81c3dabaaef52f643
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on domains associated with compromised CMS uploads or disposable hosting. This pattern is commonly used for phishing or to redirect users to sites that host malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cupanghitam.com/contents/files/rebalum.pdf In PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/pamepesikemoxip.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/60006087338.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/5336106208.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/61883058509.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493684c090c---61320268100.pdfIn PDF document text
    • http://js-space.de/userfiles/file/7296991200.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/77492701275.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161370b3bc1c68---pexuvixegedevunuvomeku.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/96553656047.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613094134f3b3---rorivinopo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/maragejanotazuwalix.pdfIn PDF document text
    • http://dubiliergarten.de/uploads/files/pizasorufa.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/walokugurumuliderowitopix.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/77002585461.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/10821106035.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/gupozoxabuwumuwu.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/mafaragimubibosusiwoj.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/tinozibekizoxedisebake.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/julipomobom.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/84907374938.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/tidisolex.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9kt91efjm7qq9o9l7s2km1e9kn/35182426958.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42c8e187c---83860370166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+11+android+autoPDF 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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 17220 bytes
SHA-256: de3d0114771c1071e1ee8b44e0491a36b2952401833035343f8cecf4dce41287
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 10028 bytes
SHA-256: 247e8dd410b7220054289f91066740d99640882bf1e8b552a953ca64327f7886