Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99e79ef3d88628d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 08:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57df84113d025bfb9dc767f4a4ff9566 SHA-1: f5c80e1888fd807d8d04ab4ac519026681c62e3d SHA-256: e99e79ef3d88628da8e28531b5b35642d2883e0eca07e72c4c80beef8c819f38
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple links on compromised CMS uploads and disposable hosting supports the link farm attack pattern.

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 http://bogaarchitetti.it/userfiles/files/nazig.pdf
    • http://bezpiecznamlodosc.org/files/file/degavo.pdf
    • https://saatyapi.com/upload/ckfinder/files/98833187662.pdf
    • https://bestcoloringpages.com/userfiles/file/19193706820.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd4f837dd---loxivokevogoxapetevo.pdf
    • http://leguido.net/files/nugasotuvokekiderivogizet.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/3844925126.pdf
    • http://fixafilm.se/userfiles/file/81209277008.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5735bd4ef---pevesegibonowi.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83a9c94d9a380688a5afbfaed5445d8b/pifatok.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac3ef1ea6---xonigaxudokemobefed.pdf
    • http://csc0731.com/userfiles/file/20210724132907_wib9sx.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3870eb7519---nuvegevosazipoxiguru.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/krmvbdcqrd8324lqqnjfo0j827/17205276730.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5215295632c6f04e537fc136230b9611/gififozi.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/5233010031.pdf
    • http://gistys.com/userfiles/file/42522215615.pdf
    • http://stigstudiotecnico.it/userfiles/files/20184691717.pdf
    • http://murphysbeads.com/clients/54316/File/27422910002.pdf
    • http://planet-for-events.de/userfiles/file/girozebufiturimaredam.pdf
    • http://eraucheta.ru/uploads/file/34846347003.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/055d0b2b9999332c8a3054b164fd19f6/dezexojexuvovexevuli.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/97031168786.pdf
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/lenaxirorebigo.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0cf6a4c1968b2e101f8650224d9c656f/vafikifojubuzozugijiraton.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=preamble+of+us+constitution+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_off0000e77f.bin
db5419900421c24a220af3fe9dd905823b261ddaaf8dbd7957cbde273fd3a052
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 18260 bytes
font_01_sfnt_off000116db.bin
53b993ec9036af0bc149b5955cd864a089a0a0c3cca9e5af67b43b32cd42da15
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 11020 bytes
font_02_sfnt_off00013042.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 16792 bytes