Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7775b796412e529…

MALICIOUS

PDF

79.4 KB Created: 2021-10-08 11:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7a06b9b87128493ad3b070eec74062c SHA-1: 32e40246ed876aa99963796914c1dbb06d97fe23 SHA-256: f7775b796412e529d00002bcdea6071086a985187fd1887d9579f52f86879bb1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aqbnb.com/uploadfile/file/22504088605.pdf In PDF document text
    • http://ufnk.fr/app/webroot/files/file/nasusaw.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/lexarulevovasubadape.pdfIn PDF document text
    • http://lg-palette.com/upload/files/2342378940.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nnhmeko1rinomdn0kt01smh0fo/wepunomo.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/75281342773.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c983fb14dce3faf43579e6e1955e5097/27995558395.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/89034766386.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/39189200986.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/43795277810.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/tapopu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d7e49deb7a---putagibupobivu.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/judopefowotafukenabozifu.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/sefegimujozoke.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/67555607998.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/fadubosonuwutavi.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/92825698662.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bofupatelopubiseluluwaje.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/52945508621.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/62315742050.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4ukssi0lqtf6ei7ogrgg4gfsm0/zafevisotigeleb.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/22001855720.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/vagawof.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/38919500006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=celebrate+recovery+lesson+5+worksheetPDF 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_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 19272 bytes
SHA-256: ee327bd3e8432854d24e330ee13c1063b4178ce83315f18403e6b64d61308151
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 10896 bytes
SHA-256: 49e6c513235da0100ef2b6b80abaf89891e827ffa97b2bcb777ee133ba5c4591