Malicious PDF — malware analysis report

Static analysis result for SHA-256 583ea1e55b85131e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 19:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7824d4eeb7eefaa084d5a5b1afc075c SHA-1: 06701a9c79c29d3621bac1ecff17ba3b467b71c9 SHA-256: 583ea1e55b85131e1308b3de13c5ef67e3d3ba558936b240c6595f78ebca9715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://synerhu.ru/uplcv?utm_term=joining+pdf+files+free PDF link annotation
    • https://seerupit.dk/assens/file/12759067863.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ccbdcef0633dacd59fd7d3c79a00945f/26858870583.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/65684986161.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/bolumiba.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/fonukupijevotav.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dulasotupeladusu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6abf353d420012ddb053a795b94550d0/vogesiver.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607420b6aadc6---viwifapefam.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/paruvipikimaniweporuzinut.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/dolezokotubexati.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/felasixaziganuxikakikota.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/38250231564.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/43759441488.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/forozodibet.pdfIn PDF document text
    • http://atomleasing.ru/media/File/duruwuxosazekesudurufef.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22bcaa85ab---44392120208.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/f9gev8nbqc0s1n5vceru1on1u0/51546467398.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/35363299179.pdfIn PDF document text
    • http://nessium.net/userfiles/file/63408396169.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l6553itsqni0rbpikmgc7lumql/90652965710.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8d36cd109---44784112902.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tidejiloj.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/virareluxal.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/58409924317.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10404 bytes
SHA-256: 65e294bc4735120891332edf44759fd2912518d9dcf4fdf3e833969f0cc81f01
font_02_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 17340 bytes
SHA-256: a61ee13b25e4f60452adfc692997ace4de8fc0e66e2e2c67fa30498609b8e993

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