Malicious PDF — malware analysis report

Static analysis result for SHA-256 4952c1eaab1c11e1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 05:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 414113989367295f6923efcda6964ce7 SHA-1: 827ec33f771fa7d0c09711532e101ab7e4a5a9c3 SHA-256: 4952c1eaab1c11e1b62225be68e5584b3e65f923e84e517ec983a32c35ef37df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://heizler.hu/files/file/53908874905.pdf In PDF document text
    • http://pwmtqatar.net/userfiles/file/29303184496.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/79512229033.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/pvjrbis3nua9hjgpj4fa7rqth1/definofozubedekusedukuses.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/73810232152.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5c73e7ff8425028138b8134f1398bc4e/60109828801.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/86275633015.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0bebd8ee9a9201584d8ee1b858b20eb9/83092238930.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/21322778073.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/zazij.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/bajunaparivutu.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/27974087551.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c13b8e8b3e692eaebf742226b6242a1b/54414596396.pdfIn PDF document text
    • http://haki.vn/uploads/files/didenuvegikabugimazovupe.pdfIn PDF document text
    • http://riversedgefm.com/files/file/tewepuzad.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1553128---86097733110.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/16d51dfa7b6f9fc47f8994183d7450c3/muturakujuwimukowuvatovel.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/483f3e54b392089310bcf77dd69ccaac/36503492811.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/mijovokogoxonajavuxuvaj.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/59392337681.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/af3ac23e76b6bc3a0c6b860fb7f4e9cd/noxujiv.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/94213262888.pdfIn PDF document text
    • http://ipllaser.in/uploads/jovixevono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+pdf+editor+for+mac+2017PDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 19056 bytes
SHA-256: cd64f5c82f1ada84de4c3cb5c983d0a42232ac9d6599f5e9c135f41d33844c54
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 11028 bytes
SHA-256: aac610bba936c66a7c35b9cc0ca6bab51aa56ee46f103c8d27cefb652751aabc

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