Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe282aba6e4fd637…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 02:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1204ccfdc924eb7196cdd750207b2c2c SHA-1: 6808a60213eeeac6be024d95bba29b8b81d4845f SHA-256: fe282aba6e4fd637cf053593de8be32ba954fec776cd020230544a05f40919ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload storage locations and other disposable hosting sites. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=important+dates+in+a+year+pdf PDF link annotation
    • http://happyhanool.com/ckupload/files/jejamateriz.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/2248739771.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b47c0a6c---84544681460.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0284a75669---xupilojil.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/66467079145.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/moxibol.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160821bd12ffaf---5695194824.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507044456.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/77341049728.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a8f60f16cf5d9c8b42bd086f955f58d7/muxuzalagajafiwoz.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/95994908749.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14c10a3d3f---fapawojuvomapotatujeguxuj.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/42175117756.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f7b9670b---kofafifajilawuxifu.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/47580420320.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/49991532568.pdfIn PDF document text
    • http://allycatering.com/userfiles/75659309637.pdfIn PDF document text
    • http://abpaluso.com/upload/file/34099673704.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/63683448334.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4211d2ad2---55030780703.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a42cf5ec419---zojimozatosamutotinomasu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f8f8b4fcaf702465efe0c7d7d7eb1ec7/mikapumuligotoludavukis.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6e577786364ce9bba9bd6800d2495ccb/85101101082.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/55506455759.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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 10680 bytes
SHA-256: d25f0c8508a9f5cf1aa4e786bd95d014da53226ca2978fd185e90b8eea424127
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 18696 bytes
SHA-256: 23bee0835b5f9c470673277ae7768f3308d685a482ea6febda3217f6d8f76506

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