Malicious PDF — malware analysis report

Static analysis result for SHA-256 57765f6097af317c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-13 21:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14e720da8243212626b5eb1e0b256ee1 SHA-1: 6cb35c9a3c56b8a2eaff693142315c4f5de12209 SHA-256: 57765f6097af317cd98e05189f6c83ccf3013f3726f817612d37f83ef733f144
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613465c73d6c3---17685455957.pdf In PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://findusafranchise.com/files/files/zimiwonasaxekebawebomadut.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/riwototijuvosolegolixuz.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/dered.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/10191610216.pdfIn PDF document text
    • http://pedraferro.com/files/files/1413838058.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/3550908513.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136206fbeb87---maruzefonezerufigegibe.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/8835190092.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42869348011.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/88236478965.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/1227936238.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/vppsq7p96dl2noiv4f3iniu1tc/zitajex.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/28551397985.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/popigovuroremufexurobikow.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/sesitizuvula.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/gafazatog.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujefasuxide.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/46756842197.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/10462222812.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b148ab56---wupab.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/3617985741.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/kumilejesakiwomoxeg.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/muwoxe.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/73071437877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+to+z+words+list+for+kindergartenPDF 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_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10748 bytes
SHA-256: eea71d258dabc20718dabf1909a1fd0d909cde8c0e765514f930d36cb71c7773
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 18524 bytes
SHA-256: c878f422a6ecadcce6119393c5a651f9abd7648b45bbc100673312a9107810b9
font_02_sfnt_off00013b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1