Malicious PDF — malware analysis report

Static analysis result for SHA-256 a345962968e8b54e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 21:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 01570bcd2828c9d3d26472141ced0851 SHA-1: 8002d535f25a77e81ef98b658f74a5f0db59c4ce SHA-256: a345962968e8b54e85fbe93381f8df8ca2387326bcb62547dac1de14559f55cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which host further PDF files. The presence of multiple compromised CMS upload links suggests a deliberate effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://elesud.it/img_pagine/file/13891617948.pdf In PDF document text
    • https://banghenails.com/upload/file/40556595997.pdfIn PDF document text
    • https://techlan.pl/files/file/84072349865.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefbb202a5---wovodoralelegepu.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/57140026931.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5f24193e6d79b85810624dc5afcb21db/19063166629.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/51u74djllj10inquvgav239v34/99362646180.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/gawamivosevagakefin.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/47900089649.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/bewive.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/wowaraxogusomo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3374fb6538---57736815390.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4688c5bf0b80c422b9750ab44ed767d4/wasimugilufukutal.pdfIn PDF document text
    • http://4darchitecture.org/img/all/genadok.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a61bb7c2---pinopivi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55686179845.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2e7d07fd---resikajamizowojetup.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/59986623334.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6305c6dd70dc1681385cfcf5b4786ec2/21889891738.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079679425f9a---42017865477.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/sizexizitetiwi.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/doxapa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cf9771830811da121398b863c908bd7b/45282267578.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/lotikiduxozeruwopogip.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/wavabevuvaledezuxuzagila.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/vixitibanixidepoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pdf+viewer+source+code+android+studioPDF 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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 10676 bytes
SHA-256: 8a1583454d0f9d23e7460fc043c03617ab8d96c24dfd7e72b32abd0db615ddfc
font_01_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 16044 bytes
SHA-256: 782b971a0171bd2badaa69a7fbec118863873f4c26af16280db002be23adec28
font_02_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1