Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99385fa81f53053…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 22:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89f442ade9034ae44a114d945591f81 SHA-1: 3aa0fd63540bdaa32418c8247334dda2ca8b4cb6 SHA-256: b99385fa81f53053338bd527b9c105248d6aee1b2a58a00c665fcba05f963b37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, several of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://oniceh.ru/uplcv?utm_term=kotlin+app+source+code
    • https://braindevelopmentmaps.org/userfiles/files/nozonewawitomogirina.pdf
    • http://pathtojanna.com/userfiles/files/wijog.pdf
    • http://nanoscopy.ru/uploads/files/81571099630.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb33c5c3c3---safufigajewuxisikoxagifi.pdf
    • http://efuegypt.org/userfiles/file/65680807594.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142d1eb06749---75734204009.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/32813188534.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/rojesavubobawabevapu.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/10477502994.pdf
    • http://naturabliskociebie.pl/userfiles/file/47713049152.pdf
    • http://etre-belle.su/images/file/bifugodusigolezepovo.pdf
    • http://labsshop.com/d/files/pusogonifedepenajol.pdf
    • http://jikaramen.com/uploads/files/jigoge.pdf
    • http://zbmbudomont.pl/userfiles/file/xefam.pdf
    • http://www.nbc.com.vn/ckfinder/userfiles/files/funilosebi.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/61d171c21cda9d426b42366351a38c20/misemi.pdf
    • http://offerseir.com/basefile/offerseircom/files/mevotatudazidemozanaku.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/bewijo.pdf
    • https://bocion.com/ckfinder/userfiles/files/65891656082.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/fvno08suik5ouu0ad51oa9v9p2/19176508454.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/borarefojanikobemorebewek.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/vexavubixeririg.pdf
    • http://citescolairedeledit.com/include/file/wavakadifovowigopekoz.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_off0000cd7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 16792 bytes
font_01_sfnt_off0000e590.bin
0dc673d50117b386c31b9af2c8bc8b19a1a43f0f2db759ec61fc9f4280341e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 17988 bytes
font_02_sfnt_off00011434.bin
18ae8d845f307a4a9781c2329fc63d2022bcb74a35eddf129250503ab484d45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 10600 bytes

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