Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdce0cea3a0a1726…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 21:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e2b73708cb320ae499516dcce7e1ee5 SHA-1: 6d3f19e6544ff33601870de6b05a46ba422d98c5 SHA-256: bdce0cea3a0a1726d1e13aab524529a8289493f9cde10443c50358c4c4c083bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372a0e87184---8842271996.pdf In PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/tebawagefelu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906190524.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/17097208457.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/79857526202.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/zowobisugulo.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zijeror.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/62824360918.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a9bf36de871be86164da0b094e819621/vadizoluzawivedaxuza.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/puvewavo.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630952822.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/58781795616.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7582b1910d8c7fd5346ddee32d1f13e6/fometelufibofozezul.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/fetuputisaz.pdfIn PDF document text
    • http://tabletopad.com/images/file/7100918507.pdfIn PDF document text
    • http://khocabien.com/uploads/files/jutajufe.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/49151078367.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/77671863950.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/wugatunemusimegegi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134db8be2f4b---nanuzimifuribewekovamo.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/50860939874.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613149b55b630---51792952163.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea008734ab---nedifapadakasikob.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109120127236740.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/10045813967.pdfIn PDF document text
    • http://langyupharm.com/upload/files/62591778387.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/nujekosulobaxodedumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=game+vigilante+androidPDF 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_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10528 bytes
SHA-256: b09150edc421c272b83f2d79e302278ef22e55d3f48ce151dba4a426b4512a45
font_01_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 17172 bytes
SHA-256: 5400dacdccc11e138f17aaed1779eb4bdfd7d66308cf0a0a52a7d6cd9b1f06a8
font_02_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1