Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f97c7436fd7f9a1…

MALICIOUS

PDF

86.0 KB Created: 2021-07-09 22:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7cf4f6d8a69a9c161a27b630abef1f9a SHA-1: 1447050b120da1afe72da56f798080d6813645fa SHA-256: 1f97c7436fd7f9a150acae41312e5e31d21f7b6e593856f3957c9d88b0eaec92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into phishing or malware downloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://buzmakov-ua.ru/admin/ckfinder/userfiles/files/pujivoxeda.pdf In PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/25159281440.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617230851.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160914563d3526---bogibixovejisojatixi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/logusomatuvanemanibikof.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739a60156e6---18781823080.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2f7e4ef1a95b84dda6ee23fee6d2f7f1/50796387192.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1e8a7139c585e5d4317cb24c588b2435/47331509199.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/95b511cfab87230d8698ced5e913977d/24752808616.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210601164937429302699.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c5f5c777282112426f52915a99048a9e/31143760503.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sifolelizogur.pdfIn PDF document text
    • http://health-bridge.in/upload/file/xarovajamawixakabovefox.pdfIn PDF document text
    • https://stopserv.ru/files/file/52315208265.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092689dbe4e5---92485941701.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608416a0c20ca---1062782430.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/81187408482.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ec9aa57c---99637695977.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0f081652---sevubamutuzaxerewufa.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/sbcjoadjultrp7aerq27j8lvp8/lowove.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886351f688---debezimis.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5f1228dc2b1071bd524d2879540a6ebe/kawugoterunutazip.pdfIn PDF document text
    • https://parkettworld.com/upload/files/25912854513.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/28886224937.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/46083746384.pdfIn PDF document text
    • http://goref.ru/files/file/vujukotup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=roblox+hack+robux+2020PDF 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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10452 bytes
SHA-256: 6e32970c66285b8ac66c40a82d6af4f58ddaf76648b0c7e4459ce32ae38fb111
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 17604 bytes
SHA-256: 6ce6852574c1181510a626ee681935d8bc8b9859f89e55f855b61066d0cda819