Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd4aedd4d40007e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 07:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c89e1fbfc6bc98e7ee4f9b8ed62ddf0 SHA-1: 9b73d22b434fda1ef9da860163f4e93d74b1580f SHA-256: 6dd4aedd4d40007eea0c13daf8cc2cf05053d573f3597461fa822cec4049d7fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=gta+sa+cheats+apk+free+download PDF link annotation
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/59119630782.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/116fb98da9759cc2993ecd3c2a3d8a6d/59259923800.pdfIn PDF document text
    • http://espwireless.net/uploads/file/79893587970.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/tupulojajemivafej.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/49054366381.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/pofofinaduvaruzukazuner.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/90393334692.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/magunakipi.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/48671940100.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/2090125145.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4268a98c16586df1ecc628eacc7afcc2/wifutidazetenafuto.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/97024354407.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/wuxosatezuxabuzigagizo.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/nasanosi.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/konamodamegexapo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0a1af61b---76962066237.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/14591079485.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/58208276900.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109051644277769986hj3uu.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/64002285005.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/97588422065.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903193654.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/53421257402.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_off0000c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC126 10844 bytes
SHA-256: 32489f4cfa78c287e443e397410bdab71ea15ea6c6dbd21c61919bbb19e529ef
font_01_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 16716 bytes
SHA-256: 2bd8d611b74d4001112a3c7094a9bc2f7cd588a06966bce8517b0e60f493cda5
font_02_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1