Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a207e28184202f0…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 16:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d241210355f3e2385ca2785b33f747f7 SHA-1: eb29b15f963dbc014d934943dac9a66e5f811fa8 SHA-256: 8a207e28184202f08ff2a91658acc34bd4aa01c3f19f92469845ef6cc51da042
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user to one of the numerous external URLs found in the document, which are often used for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--rssx31a7tec6p.com/upload/userfiles/files/20210902222716.pdf In PDF document text
    • http://ibtaker.ps/userfiles/file/sojogokokasitumej.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/23333912405.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903155317.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/29121619580.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/76961062460.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/44704290540.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138e400a27a1---89693548930.pdfIn PDF document text
    • http://simoncaulkin.com/images/32447105881.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/worelirexidapi.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/36996911132.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/buruxexobavenajiregu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/53a0daap9t50q89o7h3cp7kcrh/pexamepojovadazabuba.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6kmioqveoef5qn8ancv1nfi41b/vofadagibalopu.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/15081397567.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/kivav.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/fikogowifu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdc410a924---37979948514.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/92864520114.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb5d0977b---milojinikatek.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8f50df92---napozewubewovimazunokug.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///pigivazirulopofadesadolad.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/figixogi.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87969973314.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/wusagoze.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/doketopopitizag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=share+my+phone+screenPDF 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_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 16604 bytes
SHA-256: d906c15836fc58be2b4c59706bcbadd7ce83aa43ee3f0b8af574332e96b295e4
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 10592 bytes
SHA-256: 62a2cd877c447095008cff1d9deaf5fb18db27c0b5208a84f9b46f80b20409c2
font_02_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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