Malicious PDF — malware analysis report

Static analysis result for SHA-256 d971f7903aa14aa1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-12 21:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b520212ffc5bc6f4af8a2f38bf405605 SHA-1: 40374af859018bb1629c8ee0cfb5c8097c9fd5fa SHA-256: d971f7903aa14aa11d1ca33dadd44a5d4f9fd7c3481c97ecfb43334dd9da56cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be part of a link farm, with some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://abwcolley.com/uploads/files/tixajan.pdf In PDF document text
    • https://chingchia.com/uploads/files/202109042007566483.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/nagigagabigutazufopiloniw.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/45924822125.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/54377713936.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wakevukuriv.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109022246122674.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/kavolat.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/zikilibeg.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/51467564896.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/76736075334.pdfIn PDF document text
    • https://egca.fr/userfiles/file/xusavipasosalelilir.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/voxepozago.pdfIn PDF document text
    • http://indemo.pl/Image/files/talatodi.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210912121735.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16104230020.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/gojesewuk.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/akkl8u9qmm7jqa8aioitdrten5/98507231143.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c6fa22e9---51896725479.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/34300969710.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9fbe99a1---29386175123.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac1f5c33ecf497cd27c5dfb7cf4b6265/fekirilujumod.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/jabebavajan.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/famija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+v+free+online+gamePDF 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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 14220 bytes
SHA-256: 5dbb41a5cd5fbc33dd2c93f1eaa6f41532a5ed1f069ba966e71370fb47673be0
font_01_sfnt_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 10492 bytes
SHA-256: a2368e74b896313f1b6b1f30c353afee9c0b1e1a8ad7d42180289c5ca2246d50