Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53dea3d310be806…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 07:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a12b76f6618677799e4b424de84dac8 SHA-1: 27020f0d5ef59cb92cd8589b3b5a15ab928aed85 SHA-256: f53dea3d310be806b6bdf41ab750a437f1cb5874aa9c94006c4a8a536ec244fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content or download further payloads. The presence of external URIs and a link farm on disposable hosting suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=bohler+welding+consumables+pdf PDF link annotation
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090894a5d38f---xagumorisuwerev.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/maldma7omk2osc8uv9im0v1ju7/wewejenifa.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2f9fe0b95e81ffffa2a206ac73b926cc/dogafirapevogovuf.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/56158689947.pdfIn PDF document text
    • http://asfalon.com/__files/file/bimifotob.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/36b42c72f8e2de97f03f47231da4abac/duzivejorefalezolobuto.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/memuzobunik.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607683ce63044---diserajonerudopoxepos.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/262d78de80323168a8820e6fbaf1f821/23246093845.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/96977002202.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160890c3552b16---degukitepewefowoso.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc02551f229---49062355239.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f73458c5fd38ea822cdbb89de609422d/97823985878.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3fgu64b86acghk7fr3pdpjd758/jesoviko.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/65589406723.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/ridejuxererosuzigajoxip.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/zufof.pdfIn PDF document text
    • https://eternalbliss.net/file/71630740896.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/livejupironepajekim.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/vezomupa.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5c0b9e3b9---62576276634.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/wositoj.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69f40559f---63243648738.pdfIn PDF document text
    • 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_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 11348 bytes
SHA-256: 7356c4d6fdacfd8ba02b6e80d6bd3152e1b43c8160c5848b25b78bb280ae4a05
font_01_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 17452 bytes
SHA-256: 73b1566205f8950c06fe7ea86c306b1b26ebdf3ee5c488d22771fba259d36233