Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea160be657c962fd…

MALICIOUS

PDF

79.2 KB Created: 2021-07-04 04:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8acdd0bd562bc13576cdc411dba0096 SHA-1: de78924a7d786801904a7d7ac697cc91bbbc5b0d SHA-256: ea160be657c962fd21f16e75fa0264ba4c8b0ae377ed4e826aea0586a66d9430
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It functions as a link farm, directing users to multiple PDF files hosted on compromised CMS upload directories and disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of instructing users to open a password-protected archive, likely to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • 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://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/gern30tk052nua1dp1i1n70t5u/34683935484.pdf In PDF document text
    • https://dcoderesearch.com/uploads/kepexibijebagimoka.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d09a32a16b300b67fc27570f8b865a83/gurekikop.pdfIn PDF document text
    • https://ikima.fr/uploads/file/30867432443.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ddc4fea6---ganebibawuja.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a97108281ad6d49d29d74ff4f20e4adc/11731072590.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/r5ts7c24i77q020rt53jaodunh/lifit.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ea37cd0e---29351324710.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1b285c3e0b969b72956d9ebc1977c8bf/xuzunibopirufetere.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfc30d760---72979008650.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ce8a4e2fc---12933169179.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/lofepafamubetezud.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/862c6af982ed8d10b14dca74fbc996c2/76589810443.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/22481788652.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/13165927335.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82510125718.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609834ca79b31---vevelinumigiras.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/manaruwikalovulopako.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917c3b9350c---rilodewemeropodusomolo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949e4d9942a---68063986354.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/59666190126.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/lopojapi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/svs16q0dn0b42h9hkntlssm716/livizaginilanotamibasuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=online+bookstore+project+in+java+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 16780 bytes
SHA-256: 50c286016a50b36a954dbd87439ec596de43f1df641433f22a39d23cf46e3152
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 11068 bytes
SHA-256: ea3393d10f2d9e4bfe16a076462aef6c474769aceb70bf6a0567df6b483326b1