Malicious PDF — malware analysis report

Static analysis result for SHA-256 944d4e4ed8eab8db…

MALICIOUS

PDF

78.2 KB Created: 2021-10-02 15:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1c81feb1782665469eb119bca865cf4 SHA-1: 0997b851b5cb67282489892a87b98497210b0b6f SHA-256: 944d4e4ed8eab8dbb346f0d218245c3be22e78232774833a215f9d7d69321188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/813ca38c36904a2b6b870224dc074e24/67627380063.pdf In PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/ruxol.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/80c0e1fe898de00ff7cc3f33109e333b/84209774348.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/wojonupulemadokade.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/gisesopewupe.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/12851016871.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/sibolozokidubumatosepev.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/xugozagoxutolurax.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/xosoron.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/tozalupemazokedovas.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/sewilasisusupesufu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/71347523079.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/ravomeraloveri.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/56629732217.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/24016325134.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/losawopanowatame.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/45883731550.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614de7fa4c755---dizujisevuluzelofufebem.pdfIn PDF document text
    • http://email-database.info/userfiles/file/68439402452.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/rinazubavolebog.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/gadetir.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/guput.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/ledugusorovigatedada.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210914121300_1nxj7p.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=south+west+evangelical+churchPDF 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_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 20680 bytes
SHA-256: 6821ce28178ed67e61100ac13f1e2e9520d33e0291f8d5560fa71ebf95aeae37
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10836 bytes
SHA-256: fac5e2ea0259939251ca987b16d661f34b96a03567967e24f7061b1cc5082afc
font_02_sfnt_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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