Malicious PDF — malware analysis report

Static analysis result for SHA-256 87040262db8b1524…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 17:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4f0dba8d8c642342d3520d7b7369ca2 SHA-1: 7f23289dcfec9f255b5678cee890aecca22fa4c2 SHA-256: 87040262db8b15249c8a37ff4dacb26b21cde338c23db64cb4cbd194ca9d9c28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the structure suggests the PDF is designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=step+by+step+subnetting+tutorial+pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/392439ae920454f60fe8d8e5d5f1fe9b/94279547974.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/xidekazugugivirura.pdf
    • http://fine-cottage.ru/userfiles/file/xalane.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/kafokunol.pdf
    • http://bdnchem.com/upload/files/21487560732.pdf
    • https://labelmarket.pl/data/file/8157341480.pdf
    • http://sanga.asia/userData/board/file/bulowajuwopidixizumapod.pdf
    • http://marine-inox.com/i/File/50544755603.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c9d94c8a8317b793389ee1315be08b4/19587824674.pdf
    • https://dgssu.com/upfolder/e/files/20210922031918.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/56292458889.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/rawebidepowumajikibanut.pdf
    • http://sushinamu.com/uploads/files/karejagasagafedasawid.pdf
    • http://christschoolblr.in/userfiles/file/zovanawelifefowogonomize.pdf
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/zuxixemuwapibufujetimi.pdf
    • http://valosagoskincsesbanya.com/upload/file/nifumesurajoge.pdf
    • http://tokyoto.pl/UserFiles/file/lufuz.pdf
    • http://zzps.pl/userfiles/file/82707869210.pdf
    • http://tubietelbar.hu/uploadfile/9036980923.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161442c2a97790---mijizito.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/duxukuwanevotugi.pdf
    • http://wdnederland.nl/file/nolejiwesopobavebuwarafup.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_off0000b14a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 16792 bytes
font_01_sfnt_off0000c961.bin
8181b4d0a5971aec6dda06b96d2f81e7a0705e39baec09457cae912fda3275aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 11100 bytes
font_02_sfnt_off0000e2fa.bin
f8af09b8483650c91f9d38a2a331600808e0f1b66afeb454865b2ce6741c9871		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 16628 bytes

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