Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56fb156a2b11b44…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 10:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 568418aff70d36514a20c5b9393dcf9e SHA-1: 3022a96499f38d98bb14ddb2bf9658ae8ca86574 SHA-256: d56fb156a2b11b44ac7abb77ee538c44866bb1bb76fd55b9c4053d67da6a6da0
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://anukulagrotech.com/userfiles/file/96263874749.pdf
    • http://nakajima-ya.com/upload/save_image/files/niveke.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081e64e335bd---57299802638.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607672c4adf4b---falopobugazezifajuposijo.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090399dcf2c6---66585592520.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/tupavov.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/127de882e49c9d0170c1cadc4d3c2be9/ronajewanabewemigewegova.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d473fd02da1---3357436865.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899da507ca3---lamejibosenavawawukul.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bde39f8bc4c44855628bc8ab88f8141a/wiwimiwikujomuwad.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ef0560375ec96c8d1cb96ab7b7e677e5/titiku.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/voueck4656g777se1qm3dbr517/zejosazivipinixago.pdf
    • http://softtox.com/new/userfiles/file/selasur.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmh9035bugtntcof6ojsnbdbg1/gatipisazoridag.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/920de661255d9f4fc08368dc5c816ffd/rakewelepupelisomerasonoz.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c5c651230d935c1cbc28e6ec0094b4bd/85702140633.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160727a64d6cd7---lonojapafizetejerafa.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094145035390---zovuxuxux.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fadd900d4b---5299538818.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ceda6246---6608589276.pdf
    • https://jambukuning.com/contents//files/16154126182.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/788tk9q1q15n3m48ppq73d9ltu/71994828997.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baccd52fa66---11006963919.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=does+snapchat+story+increase+score
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f033.bin
77906f0f127b1a7e5fb8a1201ab2bda64115933e58c7c3fc643dd765609e7efe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 17040 bytes
font_01_sfnt_off00011c98.bin
2aacc705ede50135d1c2b7d3b218acde7c9baea4a67db52f5dfc9760d69963f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 10540 bytes
font_02_sfnt_off000134a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 16792 bytes