Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9bc77b6572a2d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e7af19b78bdf076bf92d1046a24b243 SHA-1: 19137e15a791361c94c968c0bd84477f05c7da1c SHA-256: 61b9bc77b6572a2ddd68727c30d5305c5df41941b4f35a6ac48c393c45a1f9e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to external sites, potentially for phishing or to distribute further malware, aligning with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://warungmimpishio2.com/contents/files/48972348069.pdf
    • http://dhleisure.com/ckupload/files/wejawajefekekewezu.pdf
    • http://www.motionmantra.com/userfiles/files/saxolufenerusuxowajuwulu.pdf
    • http://poliinc.com/upload/files/fubefugenolefeloke.pdf
    • http://duda-tech.pl/dudatech/upload/file/1442946729.pdf
    • https://altsovmun.ru/userfiles/file/29113559949.pdf
    • https://maintogelonline.bet/contents/files/gasez.pdf
    • http://unitekinfostructures.com/userfiles/file/48876423466.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/64332950641.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/50220485152.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6aptuj6ttcgburorfa2ojldh3/genofunizureka.pdf
    • http://www.beverburcht.nl/upload/files/muluf.pdf
    • http://laserinnsbruck.com/static/rivaludutaveb.pdf
    • http://garankuccu.com/upload/fckimagesfile/a024ae81a1e6704dae83f9a51efca8c1.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613276ae86f3c---woguben.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/dipiwaxekisaterujinipuj.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c939a9a1ac2483b42754c0ee94c42f34/19561427719.pdf
    • http://essentielles-theater.de/UserFiles/File/86426189063.pdf
    • http://theloanwala.com/userfiles/file/joxilirusadoxirezowezevu.pdf
    • https://asiarsolutions.com/userfiles/file/17094016840.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131482f7f0ec---80704788715.pdf
    • https://giltmorestukko.hu/ckfinder/userfiles/files/rorufowomeloganug.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1eb5d8c50---75599794633.pdf
    • http://mnogonomerov.ru/uploads/file/45354246140.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3666ac4caacd6ad9a33bcf1e4a42dbf8/97587202981.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/ferekeka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jenkins+android+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea5.bin
7497b5671f33c762b3cc1df6593db600dc4799eb031a77ffe38c4cb724c22a11
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 18140 bytes
font_01_sfnt_off00011ddb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 16792 bytes
font_02_sfnt_off000135f2.bin
6670a5799ec64678d9297e455b1bb401e9cd300aad0b5202110bf5a8bad69262
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 10324 bytes