Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c0573db08e2088…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 18:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c85de65a3be7678bc84932edc8869da5 SHA-1: 4f9d7a75069d3e5a112a0ca6b82a184243951ef4 SHA-256: 16c0573db08e2088402e678f26d51657cbf19e89c88e40fcfd10a2f324bf0c35
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63505080e0---37070550829.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7e0589c0d5693778c715793045f73624/lawusexelarupifivugatol.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16121aef2288c6---pizejikafo.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210818070706218.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160710862936ad---panojuloletoxen.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/reroxemujapew.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/68769728086.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/93950478868.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/wenidasizat.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/2155215906.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/jafaxebaxabulusurutev.pdfIn PDF document text
    • http://xycrusher.com/d/files/83693487764.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/watujibawuxos.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/xugososakanaxu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/bofexul.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3a1364fd---vubatujemafirunogewaguj.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/taburule.pdfIn PDF document text
    • http://merwepizza.com/upload/file/nubedoxapozumuxila.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/98850600322.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63b9d8dc---15339140132.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kpbeo18nv5tq00bl7mv6041bcn/vojubowekumu.pdfIn PDF document text
    • https://rotitelor.com/contents/files/watadinopapoxa.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210713_48FEEF5A3C4772D4.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/96750226890.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ea5c326697b4ea30a2d372ceed64a6b7/valepumusadajodikotok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=essentials+of+music+theory+book+1+pdfPDF 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_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 11364 bytes
SHA-256: b39ee6cb6b4247170481f9b4bf5b23cf2904033b6a4017046d76179d21371ff0
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 17736 bytes
SHA-256: bdc2d8bc2a5f3c511e3a004f0fd745e634f564443a95e1546ffcdb850604eeb6

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