Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a0c4e9e73dcf6d…

MALICIOUS

PDF

98.4 KB Created: 2021-09-07 00:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6780f690ed224c530d7562991cf40780 SHA-1: 6f994cfc76e4998ff92546415acdaf7bddb6860c SHA-256: c8a0c4e9e73dcf6daa53d55e0898d23029cf10eccb566ec3dd4b33bccbe095db
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/65400e70fec397cd6e4f37cc36cc76a7/visilasol.pdf In PDF document text
    • https://mimpiindah1.com/contents//files/najujikizeligerejajixame.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ea98261a---rinepokepunazutimevogupo.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/zubakigives.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/51020173873.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16088861b9d121---woditoj.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/13877538443.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/gesoguladefigidajidurasuk.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbcde7349---50115024121.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l2634i3rvsmu0ggfa0ubgte715/gupitil.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/90806658480.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gajekilawasikari.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zesidibubagovibevofipa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823ed3ccd6a---62281512498.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/demimosanasewawinitago.pdfIn PDF document text
    • http://infunplastic.com/d/files/ratagaxi.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/39784661343.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fugefemanujubop.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c555ecef9---60324066873.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/ritozinipizor.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3ae9f179f397423b5bacedb427908b4b/20438215548.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/91157673313.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/rijimuxogenezuvuw.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506a265583---didasofoduvudozedono.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1c058ed290b37bb81d3bdd4cde748db0/91922376946.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a39eb254e---44284097736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apex+development+guide+pdfPDF 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_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 10660 bytes
SHA-256: becd6455ff74400dd3d164f124b61d1eba817d5349e83269b9943068119d71ae
font_01_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B20 18692 bytes
SHA-256: 4c20019584de29abc173ed664c8fc9099af0ba5829dcd82bcd6f7fffb69d954a