Malicious PDF — malware analysis report

Static analysis result for SHA-256 142f1901147d2179…

MALICIOUS

PDF

82.5 KB Created: 2021-08-18 01:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63bcf726123a02c63123f67c69c322f9 SHA-1: cbeb9c95c4ffa12f5d4e352c1cede099ef3de702 SHA-256: 142f1901147d2179a9e18659c6e9252c38efb690b586efc24a1dd3a8d6cbf938
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=czasy+przesz%C5%82e+angielski+%C4%87wiczenia+pdf+liceum PDF link annotation
    • https://greenvalleykerala.com/ckfinder/userfiles/files/seruregunabefibagiwaref.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/waviwile.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4tm9an96u2935a1am4rfqqjp8g/kotakuzuxij.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2842159cd86d1b73350852dabf26eaeb/70403466482.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/71772560624.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/48768149868.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa189a916c---46828743034.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/15502818527.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/18184039266.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/60653933156.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/48c279e5ba7a5efde4202bbb2cb558df/20185992397.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/59488734443.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/77958455509.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2eeop6jvnnsqtia6e8f3vlq6b2/xudevafijetulafoxez.pdfIn PDF document text
    • https://tekmaker.com/upload/files/93746387333.pdfIn PDF document text
    • http://evola.it/userfiles/files/zodugebodu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/82788731449.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/26069786845.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/pisarez.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/51551899680.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086142dead55---45635013684.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098440ee6125---dimetesejetiluxodusow.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 18644 bytes
SHA-256: 632f910d8430c0d0b227e9da2383a61989a27f8a7775e47ebd6d1c9f90c5756b
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 11436 bytes
SHA-256: 22ab3047fabe5856ac0236c5afdc97f48fd80cc0b7f3e700ccc8e0dabd096b7b
font_02_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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