Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf58e935607c0b9…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 04:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b6bf885b070a9018856b95fd3d8e0ed SHA-1: c7f9ead24ba04f4764a329f8d545a2aab7c97c48 SHA-256: 4bf58e935607c0b952dfb66788efec969993cb92cea2a6e2b47e5d1092be04a5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of multiple suspicious URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://g55net.com/webpagebuilder/ckfinder/userfiles/files/jesabimaluz.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9d48a9c0f79b0d426cfd6f82eeb7563/33097043445.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/82003682984.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608513774d34b---89848627980.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077f282a5df0---96377276196.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/tivetijibututoraka.pdfIn PDF document text
    • http://www.asslar.de/downloads/43833985577.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5c0a5ed5e658b386d87d0145697114a1/jugamimirewaduluzu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/teweniburu.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/91995856587.pdfIn PDF document text
    • http://amandamaitland.com/images/file/79848483042.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4808e9de2f6b08d8da28745955312280/84295777159.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210613045313100.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/18338171360.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b0c8dec2bc5690bd664d688e26aca96/12404026102.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29ce900e5---degasavifuwojoluxeza.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/b3141e7822c84f369d1f517dbd8be308/gajab.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fd1ec90f7bd56cc01ca14236cf28a0ca/65393623655.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5cb742365409670aaabf17922a05352b/7194515802.pdfIn PDF document text
    • http://aven.su/userfiles/file/56336161796.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/magiked.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ff0fda99f4101db9478f05cda4c953bd/80876507427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jamie+all+over+meaningPDF 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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 10240 bytes
SHA-256: 830f0ed26ab9986eefc05f42fd40aa910475635b2e3be1731ef4ab543c7a60ae
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 17544 bytes
SHA-256: bba78fbdb5e8223908818389719c3022a8de3fdc23089b5dadbdf7545a9da506
font_02_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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