Malicious PDF — malware analysis report

Static analysis result for SHA-256 816896a66f564bee…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 14:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2723c672f43dbcfeca20002385a54188 SHA-1: b0148be52ef1beadd7bee0cb1c1c5aba3cf777b4 SHA-256: 816896a66f564bee913d1cb7578087c25f70bb76d16f7bc66f2e186fdacad5a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary goal appears to be directing users to potentially malicious content through these links.

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://lblussana.it/images/file/56590780235.pdf In PDF document text
    • https://ntc-container.com/upload/files/11155605392.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee69219f---bowegewolo.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/12417026467.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/75381045791.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/7447816360.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161433858ce887---49095594780.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/21435239514.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/lemexozuson.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/malinozazaribuxabowi.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/88028162872.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c63941f793d67d11d13ac1237974a612/pivoketelelis.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/30253309413.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/27652702220.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/10158975422.pdfIn PDF document text
    • https://vzglavniki.net/data/file/21820939767.pdfIn PDF document text
    • https://labelmarket.eu/data/file/83489467201.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/31685789348.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/7802059598.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d5d292fed240b4ec665274176e3de196/sejapug.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/scjaid06brr6cvqv2tfdpupbfc/28688309348.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vovin.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/23183652355.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/34721973280.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/58288062470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=app+per+recuperare+foto+cancellate+su+androidPDF 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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10692 bytes
SHA-256: 4d528dac8af060ef0148af0a6a2039f9ad7a204ac251134da21cb08319772004
font_01_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 17688 bytes
SHA-256: c8e4b7ee61e5d071b947633fab5ccd744bcaa3808c87765d2dd71e1da385a007