Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ef6162e03f62e2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 16:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fac9b815c2bd07dad61ecb1a76dfe5ca SHA-1: d208da3cfc2873abb7e8452e99007295e1c6606f SHA-256: f7ef6162e03f62e27f2846d3c4612a060ea146032973da5468e478aaea5d450c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kfk-dekoration.dk/images/uploadedimages/file/piditegavelokosid.pdf In PDF document text
    • https://global-brand.net/userfiles/files/65675588227.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/84371579688.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/bekusaxikajamimazal.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210902122241300958.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/nafagupabonefiwu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403e6748531---xepilaj.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/fogigudomesojurejafeg.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/lovogugiti.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/tafukovobip.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/88506352862.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/lawaberik.pdfIn PDF document text
    • https://redac.ch/upload/kapewuvelogirep.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/27497395046.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/gasajopu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b9eb304b9048cc4b3c5d8de92b075b7c/vitajebosofokew.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/misupagamuvoteriseme.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/ledogimukiroxirisanuzis.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/14684538091.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135065ec64a8---rififafiboridaluremubavu.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/jelix.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/kazedusaxoxokaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=add+menu+in+androidPDF 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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16672 bytes
SHA-256: ff104131c2117afa81a1b37744558836b4500b99aefd967cace6ad0c639f191f
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10180 bytes
SHA-256: 8afd8c71d9e01025cf43de6571012cc369bfe81ef1aada3350ff29c36ed8f305
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1