Malicious PDF — malware analysis report

Static analysis result for SHA-256 866aa5126e92587b…

MALICIOUS

PDF

103.4 KB Created: 2021-08-15 12:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6fad602285c1f9301dc83afbe730818 SHA-1: 80c6a1c3f38a6bf72cbfd842fdf967dcdf9b016e SHA-256: 866aa5126e92587bb1a9e72e915b883214da00add54382323ef72335fc8f56da
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The presence of multiple compromised CMS upload links further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=are+gore+tex+boots+really+waterproof PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/97tgiprmdehuekl4o9sq66qcdf/11104490015.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f34e3ac8ca4b2ddda7d2ab72a6cf1499/42264978174.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada9e1a20e---87132748477.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/6vgaoijck64eoclkr1sltrcaqg/wureruki.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dabbb032---nisipivo.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/lusemuwolu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/883ddb5f4ac5dfd786f7884ee4461fe7/86248533326.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/xizulidufexumu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b9bb333e---25818264810.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/banog.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/43283364432.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed736460be295752a879ceaf6ba34288/32459956810.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/ruxoxodigiwepifol.pdfIn PDF document text
    • http://sjhtractor.com/d/files/fimive.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085fed05a3b6---71240683823.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e4ecc17b599f976b64aea9d46c96d328/sizisijogavuterikapajo.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feleselatu.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/tibowebanumagubiwujur.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/17628447982.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/74687854953.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/16060414703.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bfc2ab1a---wovixuv.pdfIn PDF document text
    • 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_off00013203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A15 16616 bytes
SHA-256: c38e5639696926f31897c47d4efdc315f6d8aa01c93cd7ceb860401353564a1a
font_02_sfnt_off00017520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17520 10760 bytes
SHA-256: 9aa33f2b015b5f2301ba34dce11318faf146812dfeb0995f56b2468ed6f1ae4b

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