Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f664854160840a…

MALICIOUS

PDF

93.0 KB Created: 2021-08-03 18:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 066305327a13adb5515bf2d968ccb34c SHA-1: 2a645a34f4593df0e71857e9c3fb8d9139a55a8b SHA-256: b6f664854160840a692e04aabe78b336efdb2591d243a95bc5e0e9512166efb5
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://questyme.com/userfiles/file/teberojitetafogujesakekam.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c375fee1---kowidog.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/33967395110.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///wanawovutobu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ac96e352a04---60019724035.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93d0c08e4d---68613618035.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/87749942852.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ff54e149619fe4ec1660947d4caa8c9b/rozugovomizar.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52217f3f2c---26835708375.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/gevenujusamoranojud.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e06b2b0d58---fopumujaxarisidutiri.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160814671bc039---8085289141.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/sugitezidujiwavozepive.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee387e2e208---duforupimepinafovunajusew.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wakuvekizuwadi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ud5k4rnoghtku3c6opghvo7vqa/wunojomuvimepopedizefefuv.pdfIn PDF document text
    • https://makenie.com/upload/files/85467225190.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/befilebofibekopatudifiti.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/64083581994.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098c19c90759---17389491346.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/35805765459.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/rarasisumikakamudoviwizi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a105804ab---fuwoboxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+meaning+of+curriculum+evaluationPDF 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_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 10940 bytes
SHA-256: 8cb267de679d34c17c2501ea47c8d75a272b19c970e22ccf1a6cf0eae705ceda
font_01_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 16864 bytes
SHA-256: 153f69e7aead5bdca99d74fc28d3df28742913d2f69ee25ce77d369f30bf75ad

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