Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c61fef4279f533e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 00:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a10405d6e1ca47e184e0b5f97c3f994f SHA-1: 47dcd23d22e1d5fdcbb6624baa0fdf9fa6288cea SHA-256: 6c61fef4279f533e2abeedebfa10c72141a58e5e49b35949b01b009b67f0e5bf
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://careersourcechipola.com/files/public/fipijukax.pdf In PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nipuvagotakipuru.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/faregudunekefap.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xigeze.pdfIn PDF document text
    • https://venus-forever.com/image/files/62902067584.pdfIn PDF document text
    • http://humanlitech.com/files/files/47089597997.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vjfbnqrqf18t62t704tkvq4k57/gibijoxesavamagir.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/rajosevavuvunojewesaberap.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/waviwupepe.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/19453307738.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad698fd6c---zemebifumipazuwegukusobal.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee562a89dc---95408767779.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f544bc1d4d3ad7226b27779bdc659b0d/mabegaxizonizolipazineg.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/49863175401.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tovukanireloxobirezazidew.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/nugodekasipukitezul.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e068af96---64816961233.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086513ac0c89---wagatolinegiba.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/29594620351.pdfIn PDF document text
    • https://denimder.org/resimler/files/tafile.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210728_247AA346F753E338.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a3d022272bd36dc1e704739cc9822ac3/590810792.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/82241816107.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/14483531070.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pukapusakesadifujotazil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=eveline+testo+italiano+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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10440 bytes
SHA-256: 204e61ff527f3051a35b4c8cae0599f46285650f4831b4986c7c6746e72adf4f
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16980 bytes
SHA-256: 6253c47408294c155e08441b3343fab5a5f8f1525a99c8853576498e31dfebe4