Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58126b470958bb5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 07:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c3bbe006b63347c71fab5e50d1a6837b SHA-1: 2a0938dbe5d2136e720696203ab7bdd691d7a789 SHA-256: c58126b470958bb572d8e06a526dc7764c8676bedf90c4c20a2c553cdc6f544b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous links to compromised websites, likely serving as a link farm to distribute malicious content. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=creating+an+emotionally+safe+classroom PDF link annotation
    • https://damiel.eu/userfiles/file/35719267245.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/40530814615.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/56419436307.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddb3883ab0---gizebugawitoverugepabim.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d84453d94ef4051ec15ae526384e85c7/31714564806.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/67241810696.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/55852663369.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/41200909763.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149ced1e18bf---rupus.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/38061924638.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/bikimu.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/95673173847.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614717d3ca7d2---27075715337.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/52941795918.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615272245a1fb---zixasosijaxafud.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nolovibezet.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89687492900.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/93820352790.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210917_86F11954A3FB09FD.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/36977532300.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/86372135169.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/woripuvem.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/44586876426.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/zepamososobutipakewuludiz.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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 10824 bytes
SHA-256: 973d8b480b50dfde9dbf19d9fd90d61023069ad95dc99a7dbb07fab426a8b466
font_01_sfnt_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 16440 bytes
SHA-256: 486089790943f47f6b125f6ed8f67ad8c6d4bc42ab5288db02ec6bf4c9e99c02

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