Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4f152f20a31290…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 10:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f38028707fb362f0210241ad652bb8c SHA-1: 653f3db71bc1c326500ad149db850afb950e4000 SHA-256: 0d4f152f20a3129019749ded45c38cbdc88e63f1c8d2bdafebf5394d07cfbd97
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF links and the 'utm_term_redirector' flag suggest an attempt to manipulate search engine results or direct users to specific content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oecschool.com/userfiles/file/xirokegaput.pdf In PDF document text
    • https://radiosmile.hu/upload/file/lopigitoriki.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414fb6dc060---54220174701.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f17170e9---41475594564.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/vanelor.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/34308507769.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/93979339193.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/6381142720.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/medovosupawo.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/tofipevetiru.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdf620e10---93438890396.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/suramojekebafikuwan.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/75079186128.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/11618019092.pdfIn PDF document text
    • http://letdentalab.com/img/files/luzasisuxap.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c78edbe451---xewiluw.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415fcd9035f---dogibobu.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/tiwituruf.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/93557916619.pdfIn PDF document text
    • https://il-gusto.com/images/file/figisumogudaxetoda.pdfIn PDF document text
    • http://tfforming.ru/d/files/lorenapudugedizo.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/87782178853.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/90453770573.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/mavutepitoxutezijefebek.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/83674708325.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/63974017343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+retrieve+macbook+passwordPDF 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_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 10900 bytes
SHA-256: 12d204784399b8a341382681efabc0b3805d2a9df325a7d15fbc40629bfe3088
font_02_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 18076 bytes
SHA-256: 4394c2d9901e62a5cc6f02f2fb9ca1c9e10de5bfa202ba5fe751979ee0614fd8

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