Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7e92baecfdf05f…

MALICIOUS

PDF

77.3 KB Created: 2021-07-26 05:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 403ac3e0c0d1644b67f79867ddf0ca9a SHA-1: 06954e6d545d9ac382bac21b5040ad79cd4b5c25 SHA-256: 3e7e92baecfdf05f567388307b7d1d29ba21c2c7a0ff3016416370f6c9894fab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's purpose is to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mwflower.com/upimagesfile///vobojax.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/43816600031.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/99565587696.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/14431937224.pdfIn PDF document text
    • https://777mto.org/contents//files/tapizorufefozuru.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/judowarowom.pdfIn PDF document text
    • https://etimes.mn/uploads/files/96581272103.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/watajufuxirojojufizemu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/92301ae217cdcdebd4a7ce0621bba675/wipevinozobo.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/sokasajemujikutasivi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7212f1ce7724cad0e05b7fea9a660854/95577117236.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc88c70fd9---jilopesoxuvivositewobit.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c797124c343a9f41daf86af5dfd3ff6a/rogim.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/73892809407.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/73183071034.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/wuruboxolenejutomim.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609493d872059---ludoxipupowamoxaduw.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2a317841955a22f83fa774292b0a36fc/98574974947.pdfIn PDF document text
    • https://dineflon.com//files/turuxivazomifom.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8dbd12d7f19f1524c8376cfd4f5d116a/67682433348.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4cdf8ca7b---jasawaselod.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9d40c485---99813401681.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/40274480124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=frp+bypass+apk+android+6.0PDF link annotation
    • 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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 17780 bytes
SHA-256: 8f9d40db786c877987aff18394f8cc0f1a4d7ec94235d3a163850599a7526fd8
font_02_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 10788 bytes
SHA-256: b9f0cb79d9f422d94ce41ff853cbc98a9b6bc69ffefa554a57bcf5698d82bd63