Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f37d6b073a9b653…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 05:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba094c8e4eadf1531ec9ed967b2b7825 SHA-1: bacf6103d1254968696f17387773d71a351f24d1 SHA-256: 1f37d6b073a9b6539297cd56761ba0955db1e96b2945784bce54caf2bf9a0d04
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's primary purpose is to trick the user into installing malicious software by posing as a necessary browser extension or update. Numerous URLs were extracted, many pointing to compromised WordPress sites, likely serving as download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=reinforced+concrete+jacketing PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5ca040300ac1c231a5dd2b4f76c5f59b/6936490512.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/gutodizipabupozolab.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/zubuvakozelumiguro.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e02140050f4b3b653c3f8c67438f58ad/38433473722.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d26b10474---lovopodepituzizutiz.pdfIn PDF document text
    • http://splogservice.ru/content/file/dawufapagokaxinidomefetuk.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160974e6834d8c---nalifil.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5862727e2---84664653220.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mfki6psp93ejrt0f7pletbfr70/dugimiramasovilegowapi.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/gijijarovojatikawomidoxur.pdfIn PDF document text
    • http://farashimirooz.com/files/22978597283.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/6829904657.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/togidokineripe.pdfIn PDF document text
    • http://htwy.com/upload/file/6364525290.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/52jebdogqsh03377h0846cn937/revagemibadevako.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6efe1d78---safukamonimipufikulukuwi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106201149258134.pdfIn PDF document text
    • http://compsult.net/userfiles/file/56857242828.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210802081849.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/dadab14e6f87e671a256db83d9374843/gimeji.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/84656263793.pdfIn PDF document text
    • https://anjingliar.com/contents//files/85053898995.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/20017896539.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073822b2fb3a---56655559723.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607998483f3aa---virerukigezorano.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9c83e1bb---80427272436.pdfIn PDF document text
    • 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_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 17016 bytes
SHA-256: 45f743d527f61c277a4158b68a42cb80f74f1d6688be70f640cff67b5f0ec845
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 10704 bytes
SHA-256: 3cf5f72801d86fe729ad956da932807437f4f9e0e42ec23c564892a26d35bcbf
font_02_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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