Malicious PDF — malware analysis report

Static analysis result for SHA-256 318d5b5bdce6e999…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 00:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a40198fb18fb3887dd03666cc1c5a450 SHA-1: d5096ca4f94b0e1a79349b783f30ebd77e46f058 SHA-256: 318d5b5bdce6e9991474725a8abae0f48b6851a9c724713963bf28d223f79734
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to decrypt or access a password-protected archive, a common tactic to bypass gateway security. Embedded JavaScript streams and numerous external URLs, many hosted on compromised or disposable domains, suggest an attempt to redirect the user to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://crysiq.ru/uplcv?utm_term=como+formatear+una+tablet+android PDF link annotation
    • http://rzn-house.ru/upload/file/33344154286.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/lutekajeniv.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614160e442db6---24342967433.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/rurumewewonaje.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140751c7e9bf---gujuboparanuxan.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/57736493518.pdfIn PDF document text
    • http://wwsm-us.com/files/file/kajibufitodokipivotok.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/podumigixizozepirozusi.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/20147236306.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/liwogu.pdfIn PDF document text
    • http://maidichike.com/upload/files/zogofulijoweduvumopiso.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/43803904373.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/31862247155.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac4d4b249---12049502736.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rakotutakatagunaxisesek.pdfIn PDF document text
    • http://adice-area.com/pictures/files/geninotanoteviwimegumop.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/wogakekavalabotovekiziwid.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/pedobivepez.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gagunonegazux.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f64dab09985612a2aaee181da09c3e28/60176426907.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/84792084067.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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 21040 bytes
SHA-256: f6ce75e034756565d97b5fb6d4cdbb3606507f74b539a9d890b43c3a767e2cf9
font_01_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 10620 bytes
SHA-256: 10fa2d886caef18835ddbfdf2eeca37100fe501476a62e5e7e7250cf6a1ddb28
font_02_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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