Malicious PDF — malware analysis report

Static analysis result for SHA-256 22725bd928aa9e94…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 17:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1bb4876a76fc589a951a1a5a78a45104 SHA-1: e29df605a559b6c32883d709f6059804c0131bef SHA-256: 22725bd928aa9e943c8fa7ccff49d5a98dff6c4b3a5c0d698d24f58393d25dd2
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 potentially compromised websites or disposable hosting. Heuristics indicate this is a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be redirecting users to other malicious documents or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.informacion-indoorclub.com/boletines/img/file/17779289138.pdf In PDF document text
    • http://altus.pl/userfiles/file/gebus.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/bexesa.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/danawisujibaxi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pijijijumanilabo.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/56478878975.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/kibafes.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/zatajimukasawizopota.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c480265778---wiwukajebewajanitijem.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/57603256146.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fa95fbc8b10175afd30a21a62093038a/70034080611.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/minololitanazaga.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/wirezijogodokeni.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8f0078e6---xekenutaj.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/tavokavibirena.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/xanubaruzan.pdfIn PDF document text
    • https://norservis.info/files/files/jobezafixogow.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/68676053010.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/wojuwovalajis.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/roxinatuvoxe.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/molipoko.pdfIn PDF document text
    • https://e-room.co/userfiles/file/bijanerijaketeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=volume+of+sphere+worksheet+with+answers+pdfPDF 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_off0000af66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF66 11012 bytes
SHA-256: 28417394e4f80e77a9ba234ad1e1c877303caca2e55eaa63f089db271bfdb5c6
font_01_sfnt_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16248 bytes
SHA-256: e7dd2dfe71f6f26c2e06f72cda9ce068dae4a58c293e1503a53329d3150ff7a7