Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2cccc50330f968…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 07:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df37eafeb26799b59cdef732de430244 SHA-1: e4ab3b0dc316e400743097d81536461e1a8b7f4e SHA-256: 4c2cccc50330f96843e7e6e8419ce45679cb8296568b34c4ad36f9d765855ce9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress uploads. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to drive traffic to potentially malicious or phishing sites.

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://oniceh.ru/uplcv?utm_term=nintendo+2ds+roms PDF link annotation
    • https://nevjegyzek.eu/uploads/file/japesasogujok.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/16508950432.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614067fe5b0d3---90499079147.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/89220208668.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631208097.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/94167682908.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/vejujelunobunizimogakepim.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/soxowuko.pdfIn PDF document text
    • http://theponghop.com/upload/files/mazorepopikuxer.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/3521105276.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/liwegigo.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/jonexupezalusik.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137371ed72a2---kiverejolexujafuwajaz.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/59831119550.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/jenodakabokojotojejofo.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/29913245658.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d0803f8b0d656018a882d3c8867afc3/64665340201.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/35385260421.pdfIn PDF document text
    • http://kaies.cn/upfiles/210907070224508343i799gg.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/41301826246.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/zejusini.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/domalisuf.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/vigaxeponididuxemusid.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/4788296338.pdfIn PDF document text
    • 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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 19880 bytes
SHA-256: 25558d1751c0add17447dc704c0b4e26db80e758dae2be8060a533aac44b0cba
font_02_sfnt_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 10296 bytes
SHA-256: d70f826df7408e09e9155c2111595130baedb336cd0d528a772b7e954d389442