Malicious PDF — malware analysis report

Static analysis result for SHA-256 192b5096d46baa81…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 11:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b610d0b2d212e161160622ae4cec8da2 SHA-1: 593f74a7c4275f4aa7f9cb5797f8ebbde6617094 SHA-256: 192b5096d46baa81938a012ba434dcd824bd39ef6830570c28d428a2d6f18398
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm or redirection scheme designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6ea04fa01630329974600b70d9e5e89b/29263054348.pdf In PDF document text
    • https://hotelmitrutarija.com/uploaded/files/31214946258.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/pesesukodoxokavodeloxo.pdfIn PDF document text
    • http://sushi-belovo.ru/files/fowuwuxudawewupuga.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6208aabd6338cf02df162192797b1cea/57615723693.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160820c465ea76---62708575878.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163bd0a8439---zuwexibasutumotuvorulawiz.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/71515322779.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cff10e7bf495829caf974c5f67df2198/ronowefimovaredosereb.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/76793085933.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/27979598751.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/jukafasisekuguli.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/19fb3bf9df7647828c25a2ff970ab7f0/xobiguletufuxegud.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160784eb3afa37---safunalezevira.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mujuziresatomu.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/77558994080.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/furesexudopojixu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c12909a35a8b3090b8226d730654000b/27524192699.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c3ef4e7f6193d0e580034d733182ae7d/60999182613.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9694cbd9c---folededefosesamat.pdfIn PDF document text
    • https://mytopics.it/uploads/file/senizasiretigawoz.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nojos.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160f496e1be0d9---vutanozulitidufasemewowon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=two+weeks+in+november+douglas+rogers+pdf+downloadPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 18212 bytes
SHA-256: f13a866a8a1d6c228ce4827ffda6d7beb0eeec92b53e55ef40a0995095d6c68c
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 11188 bytes
SHA-256: 4d1a1cf3d4ba779e2ca3c64359c27d3dc16c9ce4f3aac967a4526053bfd77fef