Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb94660b617980d6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 00:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e42edfbc3bd8d753ab22c5b97ab7d71 SHA-1: 17a1f1f7253b5354dd009fca488a104fc18deb67 SHA-256: bb94660b617980d6234a0b5a541ee210547342cfd237b632c07e7ea4192c6938
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=pokemon+stadium+2+emulator PDF link annotation
    • https://tasivn.com/upload/ck/files/pavuzotipupefoz.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/67051865863.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/durejebesavipim.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/41222638877.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/muwodow.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/guxarup.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/wezopi.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/gexoxegokazemovebenazaxud.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/berilosamirak.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/90491349284.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148c4d41bce7---11834478533.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/muzovitajafojulo.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/ribokorupa.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902234615.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/30724740867.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/4229181792.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613150d3beb40---39064021526.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a60daa838---95956137281.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210921084656.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/46017764716.pdfIn PDF document text
    • http://orlickachata.cz/files/files/68196862650.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1645473255612ff6e502cba.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/15582594527.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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10720 bytes
SHA-256: 2ccc78054f186fbdc23590527bdca70a4d083f9daf6ffa888dd12af8711bf386
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 18668 bytes
SHA-256: 0e1aa245e66749f2a82a4f3a7f0b633fb1433f0683f8559e3613d9c2acd84465