Malicious PDF — malware analysis report

Static analysis result for SHA-256 0817ce815a641d9f…

MALICIOUS

PDF

83.6 KB Created: 2021-07-24 11:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66f5a1a41ab75461d14f5b16c823f817 SHA-1: 8170417fc0bb6115ca060c6021e9713e1df6a1d0 SHA-256: 0817ce815a641d9fcc3fea500443eb4eed25b4b169e6b68527e5f2768995e6a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the presence of embedded URIs and the nature of the link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tavio.ru/files/file/46373229407.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609467af9139d---84067512861.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c93c5d964b6---gogopatojulufoj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/35df791454af284e49f5181cc045ddce/30230995932.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/457a331a4417486f8e113c43ed833387/29079674644.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81efc8202---xemeladazo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gih8gioq452fcl7q1h5h4tiodo/7282428189.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/10969163631.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/23475a61dc5a4bbb436542c0a6da95b9/70578968779.pdfIn PDF document text
    • https://turbooto.vn/upload/files/62090799389.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/1973528124.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66750457144.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c0707f1d---25386955143.pdfIn PDF document text
    • http://ozari-ua.com/files/file/wulelotorurarunuwepuvusab.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811210840fc---48131058893.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/vugozefe.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/36916371317.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb106ba1b---1689753000.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095973ddcfe3---digofubibosa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7677671140---nasebepidimorufigimur.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e216501544ae6e5713b482d883f32dbd/13317203128.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/lugisitenamosuwidunaxuxo.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/xepabolinejanorele.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/94013673550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=american+pie+2+filme+completo+dublado+assistir+onlinePDF 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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 17856 bytes
SHA-256: 9a9531a0ae4e6959d004541a6424883a0ea97b8fcd0cebe481fea0bc31ac497e
font_01_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 11124 bytes
SHA-256: bf0c480adc9dc93ec94665437b49ff43bb88b5e92ac29f6d64b6b4936dadc0ae
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1