Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dfcd6d33350406…

MALICIOUS

PDF

107.5 KB Created: 2021-09-03 13:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6a5864d7a1e0ef5af8170a0aa3c923c SHA-1: 7079f70569722c7deef23383078428993eeea6d6 SHA-256: 16dfcd6d333504062db25863af1d7d94b244b98ba76235ae3e3dbab2cb73ff3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, 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 compromised WordPress sites or disposable domains. The presence of these links suggests the document is intended to redirect users to potentially harmful content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://deauville.ru/files/file/24527248771.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/birodonejawow.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984328779b9---94213077391.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f446865ab---zuvoxunomepimitodu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c326ebb4a73---41926438784.pdfIn PDF document text
    • https://seerupit.dk/assens/file/6369095383.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/83ee1f3f351249981710d757dfd977c4/51841970274.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/161166c126ef89---fazezinedonem.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/38687762926.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e6vn8ge8hpds58pa9ekf9u5flv/92474355249.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/16145220371.pdfIn PDF document text
    • https://baptistfriends.org/media/renufiligudenutu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nr9p64uahjdebu0dmmpn8tvs2p/84409689872.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/jokizagininozosarinomar.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/33827704164.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/pazesilugadelazag.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/jakegode.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/72196172614.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af01416aae---74043922312.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/33418315202.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/biraliwojipetisofazuvogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=basic+english+grammar+book+3+pdf+saddleback+freePDF 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_off00013732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13732 20612 bytes
SHA-256: e92c2464bc7f7efa74a0c15947427a0356518c7e1149fa688493a31349b9769a
font_01_sfnt_off00016d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18591 11424 bytes
SHA-256: 0ecc78d1ae84cb1bf8188e19486bd1564f446db243484ce044931dcd43d42eeb

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