Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55bd94a35a706d5…

MALICIOUS

PDF

100.4 KB Created: 2021-07-28 02:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 94eefb5746d3e2e9c80234c650eaec2c SHA-1: 8311f719e90b15ae6219c1db4184d0810b132d14 SHA-256: c55bd94a35a706d587ebb0ff92226da19363266dcce8a5e7d03915fe682958ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic findings strongly indicate an attempt to redirect users to malicious or compromised web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d39f55620---79591012076.pdf In PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/19522502755.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/pivewaximesujobep.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16095420f3f58f---vuluguf.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/46148588646.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/73252354715.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/bamebizuweraxelax.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd72ab6e98b---12206829567.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090993d5d655---notosofezevusifetuvif.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/49116340230.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zujotewabisisuzamifatu.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/26022209848.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2eb9351b80b010fcca81311b22109c53/xafesudarelugixep.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/25416511849.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/14310051142.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6da63b4e9a5642a1bb6d70ecb2e06e52/99563333701.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/529df99e78c4f3544068e06904a9f266/tivarotux.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1610e1a030---rerawopizefiketem.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f84c95a7---4701447336.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/74546041219.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/23561958842.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/49622043242.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1031443df286220acfd6f2e27b24d6f9/vodosawotoladoganowogugu.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/riwelefiwikilosuzo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d864abe43---71116337326.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/surigigugosasovufowo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6f9302677bb0baba20a10a46bae3658e/zasajuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=solucionario+econom%C3%ADa+4+eso+sm+savia+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_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001350d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350D 11064 bytes
SHA-256: 52093fdba8775a974bd01289379a32bdf4eb40b740cd50a1a463b2d9e6cf485c
font_02_sfnt_off00014ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC7 19176 bytes
SHA-256: b91be7684b269636a7b8ea2b5c8bc48fb1deacacf1ee2e528b8cb025ed772d85

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