Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eefbf6d8e3d1f4…

MALICIOUS

PDF

93.0 KB Created: 2021-09-02 13:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aab58f8cc745f64f077b512e7313da89 SHA-1: f6926babb596638ee5be7fe12a4ad6edfee19405 SHA-256: 91eefbf6d8e3d1f4393847160088c5afe1da3472dea620afd5627bf95dcc419e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fedico.ca/upload/editor/file/49091370473.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb94d91716---48874715096.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/pibewijerevokijuvu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/524cbb34b34319fc5e8bff6e96ed86bf/5021139022.pdfIn PDF document text
    • http://93564497.com/userfiles/jelabosogom.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/11838088001.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/4250713029.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/016295d5727d82a0b110d1734225a597/pivagipuralug.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c862d0604c---40978095124.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/7527989849.pdfIn PDF document text
    • http://gptools.net/userfiles/file/88034041989.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rvg2b1qnsk7thqrpv8s12lb292/80589585339.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83874c202be3bc729da441b72d62b5c9/gidalisamudexiza.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/71b96c803008e8d7491d59895861371d/22503912834.pdfIn PDF document text
    • http://candientushinko.com/images/file/xovipudemojukizunapix.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/gidibirofero.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/jugamewuluxilixud.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/78902987090.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/2868127017.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9bb58c60f7622a97d0b03cb1a93e40df/selidobopabisebofi.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/7937041850.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/nodeli.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/lakudite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reduce+pdf+file+size+acrobat+xi+standardPDF 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_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 11060 bytes
SHA-256: bc3cce8b5ccfa1e59122570b5d856e51ce80f0ffb2167171af88367cfb153ab5
font_01_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 19068 bytes
SHA-256: cdef73dd0ff7ba6a9d9d2b3135d5f733625f9607596e46275755b639676002b3
font_02_sfnt_off00014dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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