Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85d3454e0617ee7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 15:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30f93d96962a6a70027a9ec605260130 SHA-1: 362d6bd4240136a68f5c34ee22acf677350a7afe SHA-256: c85d3454e0617ee79ef935ab130309ce75d008481ba78f735121e840fb1a6b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=standard+to+vertex+calculator PDF link annotation
    • http://saluteebenesseresas.it/userfiles/files/9113427848.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/14610692477.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/xaxawaxedisiviligodumod.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd063b887---40461044103.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_3C0773B465E5DB54.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jilamatisimorixoxanum.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/jomufikevurenovi.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/vadalidonurumapuwuwulutu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ehpnmc6tao2me810jh260b7m3m/8237014040.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-3/20210903082507154797.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/74157301467.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/95075454486.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/julof.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd21e3105---61260838842.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908090310.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/57654353302.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5p5u8tk0svojuhu64ru39ff883/73637754495.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/talubadagakode.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/37486727676.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/41097803460.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e4b04b2c---nonekovediru.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/kijumoje.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/liwoxekalu.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_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 10444 bytes
SHA-256: ab1ff053131277ab4686ebd12814649a9b5d701141497054e117dcbcb2541151
font_01_sfnt_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 14400 bytes
SHA-256: 642d903b1d822ebfcf46bb359674cb5b77cf3ccff442581a8a0ebb31ae5c2f9c
font_02_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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