Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1699064c001a03…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 12:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 181fcfde78a8d4a4f11773a093ad2dd0 SHA-1: 3a3e6b192faf38c2bc67c36c057e9275a79d160a SHA-256: 2a1699064c001a036fada82071c21056e4b463078cd13cd9e06a84e80c8fe71a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the PDF's structure indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://studioaba.net/userfiles/files/9416241641.pdf In PDF document text
    • https://webtechnocrats.com/upload/file/wopumibas.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/49305165195.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106bcdcf1619---netesadolunifowimim.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/23767090772.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/jalosixib.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/nabililoparijim.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kekoniwamej.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ee21c6192---kalutarex.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c69406e4a9---96443282975.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/m8suc4j8u0nel8b429sn62pikn/16538782254.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91c4548c7---62649969901.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xedezutuvapatetar.pdfIn PDF document text
    • http://fxmeat.com/upload/file/8102d7d5340ff263250e80ca9aaf2541.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/68570447352.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jadapodisusufugunadufo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb4c6ff9ebb1984618510bf9b3fbf433/wapaworijoketerigako.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b99dd6db5---vujaxesexugavudigegeroz.pdfIn PDF document text
    • https://dineflon.com//files/podebipotizobipufales.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nvr3vhme0jp4rc1av5vvh6b3up/59109200104.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/66950193498.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/191gmabgr7k81ihsskd5uen8p9/repikelepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=need+for+speed+payback+cop+chasePDF 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_off0000b56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 10700 bytes
SHA-256: 5523d09e888311d5a9b3b3ac4316610860e7acc9e2819d9f6e2459e72e80ed39
font_02_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 14756 bytes
SHA-256: 7d261954d47c92b83c52b0ef93a51c353479b9f24222027c3b9d46325e27af25

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