Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ae778f13c21438…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 03:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 625caf98d27eb7c1999d9a3106212b67 SHA-1: 60dc08cf9003a449e34e3d303fafb101cb811398 SHA-256: 36ae778f13c2143870ba63a8362bdfc9282c954c4d43f9dd28acacf7595f727f
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 identifying it as a phishing trojan. The file contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=conditional+probability+solved+examples+pdf
    • http://alexandraharris.com/clients/36054/File/2068062417.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/vegabu.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6o8heikgfbiar0b5rjvl6daugu/goredofufofereti.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/f6ktd9o3sf4rg9sf098fk3p82f/pagibe.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9246e18c8---kediwofavixup.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/s98j7b358ftptut94v6hbnfptk/gigiliromozipojabe.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4423affd2---gavifazijuloxaz.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/46a94b7f9e06b3c10d7bdef24e7dcb53/25781101125.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b71f35a5a4f---75864385253.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd071bb18a---36504192542.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/47919e7d1ad401595a10784d0a1c3b33/papef.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2f7s3g83c0h7ipjm6fdv9mso0u/91294202087.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6ad8ce5b---jexomiwijizuzidilu.pdf
    • https://aspaeng.com/files/image/files/11772724687.pdf
    • https://victorybear-info.com/userfiles/files/27649248151.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cbb23e21f80f105fb5e5babca71fe68a/sexoxunesidoxoli.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p1vahmu4v1t62gjnta9amqtit0/kupakanawerenedixuf.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/60ecd0749f48e3b88c703a7f58ca51c7/51667131982.pdf
    • https://laser123.com/geektic/files/zedibozirezepazeluwati.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/ropanokugonexizasijexuw.pdf
    • http://jpind.pl/userfiles/file/85657238579.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 16792 bytes
font_01_sfnt_off000107ed.bin
cd17c263dddcc72686664fbd82445a09980925186633aa9d66a519c8068d6e79
pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 17568 bytes
font_02_sfnt_off00013681.bin
9985d8728f513b59b9875920879a012794645317d0ba3bd86a7117137aa54f9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13681 11112 bytes