Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d404f2f7c30dad2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 22:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ecd83f2be6cfb0fcdea84a96c02927f SHA-1: ff9738310a11c2a825d435e2209afe4e65614141 SHA-256: 2d404f2f7c30dad283999d00eb5afec1635be084c1dddd9fc25944ac7c4c25c9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to exploit vulnerabilities or further obfuscate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://yuanfuconstruction.com/ckfinder/upload/files/80030584253.pdf In PDF document text
    • https://thaiahpa.com/flash/files/22252539022.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/zexinapegular.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8e03e33cb53f58879012870754fe5c0b/12050757822.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/80848179205.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/pozirolugavudezebipol.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9bf5e8dc2a78589bfc4e84f1b0ee2cf/nakexetelamiwesidesuxe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u02m921dc9t4c0qqqoi8ivoami/kexasemojete.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a14c9673---samuvolegilu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k8q4q7ok8g5ahgk0shooa92ge5/zanaragupaxutulexu.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/zuzonagolo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5fc15baf3---10044052578.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/01ppr1kim0kdfch7bg3t0lktl3/34320091604.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c496d65ffe---12358319662.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/pujagiruvuxivedotoxaxuwof.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wiwulopiromodotowupup.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/kunuverekawirawe.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/sikibixatadusegosibesedo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ecb8tqjdrha3kae449krlvo530/zupebipufo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607470234e861---savuvodukejimijazewo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/uovg7euuic1nbckkq40q2erl87/xarugat.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/84829597789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+marital+propertyPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/jodafasip.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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 17428 bytes
SHA-256: 7adbe1d52c4b23e452631abb294c3f01a2326103230bb9e0a5be971616eb074b
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 10520 bytes
SHA-256: eea550fee1c09fb07d36331e490455d1384dfac0572d10eff2a5f95796983a50

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