Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1b7268a323b7b4…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 14:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d16f6a5b5e05a4eb58660ee0a82a0bb SHA-1: cc50e1116167022e4a40e50aa993f05806058606 SHA-256: 8a1b7268a323b7b4973e17390f293d182ed01d9e50bf4d2ae1980101bf693578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to phishing or malware-hosting sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=nm+force+to+kg
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25869c4f6---77525399520.pdf
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/49vd44gu90unoiil6k9mqui5qs/rifejokavogovomadufuf.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fb1ff06672f59bc0e470ff85b549ca32/xedemukijarototeveg.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/zotekeger.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609838873284f---39897948971.pdf
    • https://clubsportedinburgh.org/userfiles/files/80118884542.pdf
    • http://farmaciafici.com/userfiles/files/pegidagodiwuxologavi.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/97094121983.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/apbq1f5out8l2e12j0qlllfkec/36953882707.pdf
    • https://soechi.com/userfiles/file/dirobadar.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160947911b6e0e---jomix.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8f8e23025f55ec2d2649dcae8b9cfd8d/mezanazuralofowisi.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd05ad60c1---52584884245.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f093889efa1b18db312545b4bd6d8870/77693087959.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a45144b939a---bazesabumabanemamev.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/48385646259.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e78dd0d67---tewitatire.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/aaim5uhpkm3rbkgao7a5nqv684/17731992801.pdf
    • http://agendatourvietnam.com/hinhanh/file/fizisupofediruv.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/o9gvg0s91p6tnmnilamdkfhmg7/wilijizafofad.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7q7htqta2f1k4nphbahfaitm04/gawumibijosetamo.pdf
    • https://sasalidayanisma.org/uploads/file/jitosodiliwurikuzetexo.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1b3be9523---95293973201.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/ragiwomemiviseguvulupe.pdf
    • 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_off0000e8a1.bin
ffd8ba71321a0525a518e5eec003a11762324d5c6c604a910985f0d929a0aaa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 10176 bytes
font_01_sfnt_off0000ff78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
font_02_sfnt_off0001178a.bin
a602714ebc47f55866c9795205f641e41542d66195c800859939e3451c0c7f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 18060 bytes