Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cc3a83b8d024a3…

MALICIOUS

PDF

77.9 KB Created: 2021-06-28 18:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acf35f40b5b64793f59783d786479986 SHA-1: f020bc058d19f6f0992463c4e4fa1710db832663 SHA-256: a8cc3a83b8d024a376e0b37af5711d9e89ca0faf6d27cb1f6719f6f04e3218b3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a Pdf.Phishing.Trojan. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links point towards an attempt to exploit users by directing them to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://aradmissions.com/ci/userfiles/files/balula.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62605ab60---74404642845.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/mivanuwesinu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3bb985ad15e18f3a201600fbffeaccdd/67574689800.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/relazodexabipenawogala.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6de70d97---zalokipobuto.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/92724992487.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/91941309593.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/lodirelolupulaxotox.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/37569720811.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17057ad2a5---gotizas.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd3fb178c---3902460921.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9jv9h68lku4askvmg6ss8ft7v4/63391308809.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a5kqfgfrkb35n3vmtnr7suoco/89891483847.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/61721576191.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/20421269410.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f965f7deab---64551555469.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84e336589---76220903162.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/89b4f2b3046eed544fc6531cb1b6309f/gurefi.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d885fdcf19---rabusalajelupogusujitag.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/60267185892.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4309820ef494f5b4d8fc315f55ff4624/11957485545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+a+drawing+of+iron+manPDF 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_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 16780 bytes
SHA-256: dc169737b5cf03b7a1481959dd9329e7c3df10d44fc6d37b881b1fb900d80809
font_01_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 10652 bytes
SHA-256: 93f9280171f23f52e8f2c138007269992f342ac5797328c0306bc5a9098d49f9

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