Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7059d1de7f7fc98…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 09:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d831ae3f635bf19c0dc5ce571f256a43 SHA-1: 785823c01d8fa5470df0b5c33555e046aea65bf5 SHA-256: a7059d1de7f7fc980c67eeaf92abba14d68c408ca70a7044fcb3d20b1a964049
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e5a3bee2---wukorakix.pdf In PDF document text
    • http://anhopphat.com/uploads/files/6812415247.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/12066818360.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0203e249c9---jikaxorofidu.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/nadimevivosuviv.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vimojitesaporuj.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/64255082752.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5df4019dcbb6edd180a52ba98c3c32b9/fadezukusatejo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kt1t2dagf0brv49flkg5kkv2na/38801767882.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/92hal18e9rm80r7l52j1loujf1/bineretezaguw.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5cf351c6ffd18ab69ef8d8fd10c0e547/58688437494.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4qg8tcgmt3gf182s658b6lgcgc/86520160194.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/slil6e10li2a2733n07u7umm1r/20621294939.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fbim0e55j3s36gmrsbjj8j4uc6/kufire.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/nuzerus.pdfIn PDF document text
    • http://darec.sk/files/files/62419429588.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/tesofutobejamuvifiwumug.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/zujobinonawapumuxifivo.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/sosogasejaweviko.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/31893185304.pdfIn PDF document text
    • https://medtek.vn/storage/file/xizusodujexilisasesupi.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062605304570554.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210521055421_1302031853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bioinformatics+genomics+and+proteomics+pdfPDF 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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 16664 bytes
SHA-256: 64550a89036294a81be3f4b2e0687edf2d1902369466091468b30550d2e8f066
font_01_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 10968 bytes
SHA-256: 5e6610f379fa09644bd1e229742ca50c94aedb243291040e064890a12eea1fc5

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