Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e24ef6f24354a6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 19:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48c82d2dc80914272858efbbeaa6dcea SHA-1: 540515878754ae0a0c4af01ea5c3d403f519971e SHA-256: 44e24ef6f24354a6daf90ef0d55d3992dcfbe6c83cb9f3e507324b86dbe9201a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable or compromised hosting. These links likely lead to further malicious content or phishing pages, aiming to deceive the user into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abzesolar.com/uploads/files/92865797262.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161355d699c6a9---29288443336.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/xilugavelidomasujukibusom.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090503194423.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/tefaxipelikedetolufaz.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/newazovebivuruwu.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/57655500469.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/51682757128.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/91233647860.pdfIn PDF document text
    • http://rsst77.ru/upload/files/26844586003.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/98459901534.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161365c52292d4---liselusawuj.pdfIn PDF document text
    • http://rld-carbon.ru/file/nafejatamizidimujabupubu.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/tifepugalizujaseligugoz.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/20775252587.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/dulafuveza.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/birijatu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16130d96f7f5fd---diwafuwexoma.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613407148d543---sogotevunavumanafe.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/vadewifivuwosimojivogez.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/64516010667.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/1138195363.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/33003058618.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/iehrmjsesfpdoh7ueh92s7qrsg/34595986046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rneasy+micro+kit+pdfPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10988 bytes
SHA-256: d18717a7f4365e3160bd153e8286285c377ade27b28b15d40c12973cef46cabd
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 18852 bytes
SHA-256: 323846f6e43c74b8010f0078fe36bb475bb515fa6783edf9b23b03a6908bf356

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