Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c56fc5b1706646b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 03:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7983ddc9386247b7acad4188340ff13c SHA-1: 2fce2e4de472646087840f5574a99cc7c6f01ed7 SHA-256: 4c56fc5b1706646bc15135af7c7af141f0e79d7380d723b3341a4c3f667af958
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple embedded URLs, some leading to unknown or potentially compromised sites, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.padanguparduotuve.lt/ckfinder/userfiles/files/945234685.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae004344a---33212771430.pdfIn PDF document text
    • https://red-adlay.com/upload/files/21766519967.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e966caef5a33d22386a9dd30b1bb7044/58490444741.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtcc41ma7375dmddcqdaecofua/mipede.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/tuvudinolaruvesagox.pdfIn PDF document text
    • http://ktcz.eu/files/files/gizolejukuluwex.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/68302221757.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/duguj.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/riwomilava.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/76460739794.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2fh4kuf67f02sb4p1i67emck0j/wudidexur.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/45187102927.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0f9316ab97cc6cb041e5163bcd2a2698/fikiwawakozikiza.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/35ad117d030949d840f7a7f398a51c54/segogoxovigufusep.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1fe9e2311---77265652663.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/02df8bf63ffcf0d1bee9f7f6837f67f3/77013618040.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161081d9df15bc---35725079838.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/106f3eaee7abc1646d3282cf03886262/satebazajufawamasinobaj.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/66412149462.pdfIn PDF document text
    • http://surtek.biz/image/files/20150128_094007.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5vqv5brlaeb0nk4dhcii83p7n7/10742843723.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/wamuzenakudibawetuf.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/73787933630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=exercice+corrig%C3%A9+genie+electrique+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B9 16764 bytes
SHA-256: 97e240590cda79858c355ce29a03fe49c8de75db93f162ddcae06e24177cf6a7
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 17280 bytes
SHA-256: 62680a6a69dc6b10bbd7fa2bf2f8065a7818d1c7772eba104efb5c375221c075
font_03_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10948 bytes
SHA-256: 5e799fc9f9f739bab74393897bf62c3d653efff803a20cddc9150d891b338fbc

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