Malicious PDF — malware analysis report

Static analysis result for SHA-256 893851f080ede685…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 07:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cbe1398b301d61e8cdc80f55a9827ee SHA-1: c35ed58bb64288d4287d1342e6ef667016d27d1f SHA-256: 893851f080ede6852407c63d737c2f145bee82192f2658b8c48e91aa63e32473
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs likely serve as lures for phishing or to download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=perspectives+upper+intermediate+answer+key PDF link annotation
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/92028629689.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/gufinesoxakisab.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/sunisimomefoveriloji.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/05a5187f8a7d5df0a37b9ade67910e64/zuvamir.pdfIn PDF document text
    • https://kopari.hu/files/file/20226863420.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315c1b29a88---setuwatuxijaxubi.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sulegepijoloziwepunigu.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/9640751985.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/bedamujigufupimomo.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/lixuxuturobejudovalivir.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/jafatabozenixikiz.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/temipazanekokolib.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/jozunemava.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/90276602828.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/94786119184.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/28317869288.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/wevekemawapisedopu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133565faed5a---4565842062.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a7e6174b0db737c3a0b21fa7328d14a/wonupinagiperipiripomo.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/sogemaxebupoxotitavedugi.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/favonijev.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/72054797406.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132532a0bc5a---kizejuwamo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lanuzaw.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/moxifafedugajewa.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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 14888 bytes
SHA-256: 49d0b1884bac30bf862b388fd1bd3ae4393e8612ff039b2651881008467f3bff
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 10968 bytes
SHA-256: b448aa1888c17dbae81830f39cc8faff3579b91ab162b4b049e3d0f92aca3a0e
font_02_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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