Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa19d17e8790e1f…

MALICIOUS

PDF

84.2 KB Created: 2021-07-13 18:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cfdb0e8be0bf45fbb604966376bf56ec SHA-1: 2a383d856616ae2573668e67529566c4dcf8a84e SHA-256: 4aa19d17e8790e1f77b2f2350d7b4fe56e9c1d76541c414f29ec2c0edbbe6896
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to download content from these external sites, potentially leading to further malware infection or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://foodchemsino.com/d/files/41642987373.pdf In PDF document text
    • https://graveyards-fuj.ae/userfiles/files/68667788298.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/kewokalamubatubewubo.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/moroxotigi.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/38541630134.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093053d7a590---32497881538.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160813f9a711b2---96506167159.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/batexi.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/tomukifajumilezulasexabu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee304d76e---74388373469.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/vadotaxomipadalekolibo.pdfIn PDF document text
    • http://camwater.org/media/files/lakuxozimafatojatapexigar.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/35101994790.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kebatawaj.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210601150751.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/j4nalrc8jot9puflgrcd6hgqs6/22997023315.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62efa2b8bd---lopajoludumiwi.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/upq4s51v485fc94qvjrlfqm129/66345844731.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/3386535903.pdfIn PDF document text
    • https://langumeistras.lt/i/File/52884651561.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/irog3l5pjnl6jgk5cag90c61m4/47265268067.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d8th2m3dmjqq7t4fij9pdcvhep/lupavu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b9bf1261acef2af86334f219629779a9/podolewuratokitogi.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/27732337343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=time+of+our+lives+mp3+download+320kbpsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e241de9767---24613716810.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 21196 bytes
SHA-256: b3795e92eb1b3d6ba00e3a52ca31da8ca0d39ca3d65cc7e36449ea0fff5faafa
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_03_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 11420 bytes
SHA-256: 35c2a97dcaa32cde0b31d25c30ab74fba2e02ca0e8a295782df05fc908bc6390

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