Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b6d78f5b1e86fa…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 19:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 941889855f9b3b2c09cf1e9322680114 SHA-1: 12df2753dae52cbbbb7ab710525b43061dcfad99 SHA-256: f6b6d78f5b1e86fa70481f9beedd7f896f9fc0fd6ab6dc6c171c3110781d7799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that redirect to external sites, some of which are hosted on compromised WordPress upload storage. The presence of these links suggests an attempt to lure users to malicious or compromised content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://icaalliance.org/filespath/files/20210920161758.pdf In PDF document text
    • http://sacmacbook.net/userfiles/file/xeputoj.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3a3f4d68e---77306728529.pdfIn PDF document text
    • http://pk.mo/userfiles/file/91206639231.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/jiniboronutizuxofikuv.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/tabezorivuwatunaludorog.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd3ab5a4b---1093326960.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613472d2a282c---visekozatixosakofil.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/ximenufojatowerijibekobex.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/zijutekuxemofad.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/67066288386.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/letakozegozirozixi.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fefalepitofe.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zesazo.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/dupodogiligijokokiwox.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161565506623ab---bikubebi.pdfIn PDF document text
    • http://taociren.com/upload/file/210909192126044293rikt5gy6mvi5.pdfIn PDF document text
    • http://pinxedien.net/upload/files/nezovatasezimu.pdfIn PDF document text
    • http://hingliltd.com/userfiles/toburar.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/bewoduwofawade.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/kelopoteririjad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=brigadiers+at+homePDF 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_off0000ac18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC18 10600 bytes
SHA-256: 767647c22facbe3ef216758d484f3b6c1299f1a3b2ffb3dc6dcd126b6e36b7c5
font_01_sfnt_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 15152 bytes
SHA-256: 107fe1b2bdd257066f9680edd8a2ee36ef0335e3d2d461a427346b68e15e8cc2
font_02_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1