Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba9880ffe108a54…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 18:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dda40b6b4f0d3835f56f9af59952781f SHA-1: cce35fb8d3d98a9542c0c48f20d643a8d4fef846 SHA-256: 8ba9880ffe108a54a976378a55c549f8f97aa06d70482d4e5ca311671fe42a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall detection pattern indicate an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=how+long+can+a+goldfish+live+without+food PDF link annotation
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6e73257a719919672a057a9dbd3a20d8/zazupufisikunexinelerinar.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10658119338.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a4cb73d4---26834431580.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b220d3dcc78---38082357041.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/55829705000.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca85a52887---81089265155.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/veriludutuvasevenuvowovid.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/1dui4lue70lhio6nrs8qmud74p/2819228998.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/75188787647.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/50953321357.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2577bd1d5d---novarezetavagelulunemafut.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/47hq722m1i15drquesceipl4r3/28061781598.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bf03e445537520f0910fcb8a17320ebd/rebasejotunawor.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/29731813684.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4754e9e8f---zagiba.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bv1bumgo5ssut0j29qnvu9hhd1/setopativasisejamedefegad.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/61174198517.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43cfd73fc8---20355880345.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb66280685e---xesakevodobig.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/83788839596.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/495126960799699610a2854e992e0e5e/zexifedoridipobax.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/70147645356.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869db671bb9---68189880895.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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16924 bytes
SHA-256: 19b557b7730b4d8166f302d1cc1ed6d9c52c2b2d2745972cc3dd5f2cd4993df7
font_02_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 10896 bytes
SHA-256: 35432be769c53cae9a875a393e342e3969a8daccf6fbc043af15e7320babd224

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