Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d23074be9df9b81…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 20:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f67c8bdce4ccf9b188c309a08273e812 SHA-1: ddeb35c3636ac074f1ab5ecc58c7fb464b3e1fb4 SHA-256: 6d23074be9df9b81c7caad072ce5dabc275c044eec3a1df114a0a71eeaa3064e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dveropolis.ru/upload_picture/30211563255.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608319eb25eed---61333131722.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/kujevisanamugidus.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/51967dfae77d81a872a58ed672b5e6b8/70301609117.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37da6b8ee0116dab52dfcb88e409dff2/ridukevozorixenotalif.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/18056198093.pdfIn PDF document text
    • http://llux.vn/uploads/files/bofab.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/fedegegufaxiterarokilosi.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/88013183911.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3182bfab---xafipe.pdfIn PDF document text
    • https://service-panev.com/userfiles/dixawegoraxosazevarulu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378cdb9c52---11438185777.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/20687099432.pdfIn PDF document text
    • http://tochalco.com/uploads/files/fatudososebudop.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4288c78b60b1efce92d98a1df955034/mupiwif.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/bowufasasamaj.pdfIn PDF document text
    • http://rayanchem.com/d/files/gumexadusilan.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/66358242603.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832cab2d5b9---46747230422.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/zaralina.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/14/79392287763.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/poboxevovivikuwobon.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/80468281398.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e957996ca5a---35874992375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=movavi+pdf+editor+2.4.1PDF 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://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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 10548 bytes
SHA-256: 83703d5657ca68f55669677048976fcec92ecbb2dad8547f972eecb846b6867f
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 20120 bytes
SHA-256: 8d0b0ec77a97ca5d3714db9b62d4d2eb94905284fc28733e925b38f5f240ba54
font_02_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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