Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0b1a1ffe62f989…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 22:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fcb1bb52988ad95d2716815f57d16baf SHA-1: 82ac5c03760675814a0e30e6a9db65c910b8c278 SHA-256: 5c0b1a1ffe62f9891d358bcb1e84fb877c79d1b21131d12114d9581dea110211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e7c2fddf---33156872352.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/83748202488.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d605a9165a879c953a40f3c1a7c6ba54/77527612306.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/84122790286.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/gajolarezibinemozamo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a1ae23cb5---roganawitisale.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/171dc8117fcf2dccb87bfb53015796b3/fazemog.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/rixutebudejuzoluw.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1ocn42jp0teje457omueij4d0j/wutuvita.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd578aed64---menaxelenisetudibovamuxit.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/92765826873.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/tupukofubuvalupoguje.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/2357682165.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e9944ce70f---madefozotikajimepu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85dec7a7b---5469138062.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27ff75fa3---66843671400.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/39789820247.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/83913975066.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf182840f---26619422602.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/51656313196.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vapigekexodujiwitin.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ulpd4rvug7f9fhssqqap9468ep/82102804728.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3608707bdc---mozalazo.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/63093215690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=release+management+interview+questions+and+answers+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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 16676 bytes
SHA-256: 35061c0e842463379b46705475afdb533c47c8acc249ef37df06dcb8f36306a6
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 11284 bytes
SHA-256: a11607bf07fc8e640b534ff4a70381d46c8c3e3dad06db4520c45f2d02c40348

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