Malicious PDF — malware analysis report

Static analysis result for SHA-256 536ed390db262583…

MALICIOUS

PDF

89.0 KB Created: 2021-07-04 08:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 064619932e511d0a06c7027d96fb642f SHA-1: 5151afc2f3ee8eda81d33da1300d36d5651a06f4 SHA-256: 536ed390db26258308a60fff279481712bda0c64217a53b4fd3794a0137e16d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3pd4jloi1qrfpqqgi4tfifimh1/54477867468.pdf In PDF document text
    • http://americanewbie.com/userfiles/file/43693861714.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/seripa.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/zalomokuferanimakosibat.pdfIn PDF document text
    • https://edarky.net/data/file/66705917767.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tutine.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844d5e3783---99256899440.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/26860196678.pdfIn PDF document text
    • http://wwstationery.com/files/file/xididiguvufove.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fajusetik.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wapibewukabekudubanete.pdfIn PDF document text
    • http://bichvan.vn/upload/files/lituwijizuwepigofalora.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/72750859505.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1304a6d5a---jobaka.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/caf3a1241766d4d65bd5ed21d965966e/soxenusuwetijosa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d527886b790---tabafijoz.pdfIn PDF document text
    • https://mauspro.net/upload/files/kafegokijulutepinufofab.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb893b5f04---kekepewibazosovem.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb5c8cd88---lamazaxidakuriwolitidise.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/66565039435.pdfIn PDF document text
    • https://coevent.ru/upload/files/xebokuxezilipozebe.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7srbgrprvi7adof58dldke02t7/59999273357.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b1651ae1---41647077300.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/82796629715.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/59052726821.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3d8c53d2---jepabakud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+chronological+order+to+watch+marvel+moviesPDF 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_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 10960 bytes
SHA-256: f8cf8647d1a327ece198f7b5f7994a28daeb20f019b09f1d1ab2d6a964808b01
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 17696 bytes
SHA-256: 87f727a61ba87efe54fc04b27fac8a525e84f1f0a990e4f6346cbd75b4fbc869
font_02_sfnt_off00013e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1