Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6604ebfe550e1d2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 17:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1f758578bb81e9b1e69a6ed20d0be381 SHA-1: c294ef98341f3fc85cf5efe177c8d4f2e2adee41 SHA-256: a6604ebfe550e1d2db55fee2ef57c4748c80dacd144facf1a6c8a6f570b16811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be part of link farms hosted on potentially compromised or disposable domains. The presence of these links suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

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://crysiq.ru/uplcv?utm_term=managerial+accounting+for+managers+noreen+pdf PDF link annotation
    • http://vangphutai.com/images/uploads/files/lejisisesisabukapiwud.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/vobamojomujo.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/lufomilujinabejadipuf.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16134163c1d2fb---90524577215.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109242016066612.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/pujirapiwub.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/kenibudikiveripo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161404655b7fac---29551786915.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/96065970731.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/zafotudineg.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/jixadevedotakor.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xibixolimezomagibepoforop.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210929115321_1435397124.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/49789503105.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/56817456501.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/88789942003.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/30641035656.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/23418924190.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135509e1b2ef---13512642134.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613933d637bd1---towodumeke.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/90749737258.pdfIn PDF document text
    • https://grouptm2.com/contents/files/tezenetor.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/monovepokunekegag.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/bosumixotip.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b49570c2c---28154108823.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_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 11056 bytes
SHA-256: eb871b3cac522c681cda13ba1bea0f20a85ca88d8b03a8ab1f680cb8e4809d85
font_01_sfnt_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 16184 bytes
SHA-256: 749e0053449a41e291c8f45ff7bbd4f766f6c2f74d318104137e6d0af64dbe73