Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0b65b0d5b4f093…

MALICIOUS

PDF

98.9 KB Created: 2021-09-03 20:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f716ba19e115e45f81dd0dbb7b9c8187 SHA-1: 0904d84d193c8ad7565ac1ab5ce9579739196be5 SHA-256: bc0b65b0d5b4f093d99fdabc9525135f8d0ec3e443c4d5a3c14c2bd932166a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=flat+roof+truss+design+pdf PDF link annotation
    • http://travelshops.pl/userfiles/file/24425001367.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b723349baf---gisaberotedel.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fufve90gvo5fca9cp152ahscel/25312658219.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/30868471320.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/xopubusuke.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/8024696019.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f32c5bd9a---figiruwuworu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/fubidosasikafifukeduku.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e0e9b1784---25028016418.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/tonifulaba.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cfcf86af8f75eb2fd5108bb68dfd7332/xojim.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce58c3bbc---noluxagipuleburevela.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/gedalotuximizosimuvabux.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9b5219fd2c8fd748266e12d16b08ee97/29999388551.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceaaf8ece9---kenowo.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/29166220465.pdfIn PDF document text
    • https://wineart.online/userfiles/file/saboweseser.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b575d846b---14615024950.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609450d254246---rebetufusepabusekugaxupef.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae83bbe9a7---62552310236.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/suzivoveg.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/14524592053.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/49b06a92099def0f8f8d0090adf654e9/40343843920.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_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 17872 bytes
SHA-256: b38e33d84722a2eead81d493b54647140fc6e0f02da3831e6aa4c2dc4f738741
font_01_sfnt_off00014d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001656c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1656C 10748 bytes
SHA-256: 5d064d05ffc6c79496dd36592f601040e44b8a2dec3b82281ffe1c684f3f7ae0

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