Malicious PDF — malware analysis report

Static analysis result for SHA-256 a653bedfefd4fb49…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 15:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9477cb0e524d58e9dbe6798d847d65fb SHA-1: 64d846d533c70c29b76f1b14fae39fc5ca888f20 SHA-256: a653bedfefd4fb49d494d6e1c9bd1d8e004fa950a04c32298dbf28f8f5fb0a35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gencatakan.com/upload/file/mokeratopuvol.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ab820c4---femupugebidozedituvilusiz.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/jexamanoma.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/76891753941.pdfIn PDF document text
    • https://remini.hu/userfiles/file/xutenemobivedapin.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/15679453859.pdfIn PDF document text
    • http://mamitobe.ru/files/file/luzarilosopemu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49cc68d81---59356029379.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/goginubisabifojilib.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/61683506502.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tifadunikexazox.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xokukewopelagopi.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/93957121738.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613625364f625---54666970872.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/fisosafopezan.pdfIn PDF document text
    • http://glassick.com/userfiles/file/36795980402.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/sagewovibupojebodivemejal.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/28275029620.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/33264349633.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6fa201522---soviz.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6439210534.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/93791970382.pdfIn PDF document text
    • https://nexapos.com/upload/files/86249537269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=highest+gb+android+gamePDF 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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 10780 bytes
SHA-256: 30153c5c7d3f8e4fffbc1bef50e175a65ab4b644c36fd28ceff8968e2f6b2a04
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 17472 bytes
SHA-256: 4eb6c5346237a41316874b2d4c8948466006dbfa1afde47c21b0a07c8804cd99
font_02_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1