Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97ac580b45f90a9…

MALICIOUS

PDF

64.2 KB Created: 2021-06-18 13:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 770b6faaf4b9f9c5f2b59b9f0b15c161 SHA-1: 5ce2b8c96bfebc69ea23abfe951717e3318c51a1 SHA-256: b97ac580b45f90a91f89d5276bc3dacf16af82c5a05f64e2f38c57d3f2d6b40d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be a lure related to 'Biologia molecular y celular pdf libro'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://jkbprivateiti.com/userfiles/file/72645941311.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6fde965be23a9364e6eda2636172ada8/zepebubedizuwalasi.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kolesuzunefibufor.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b47a4eabf---basawu.pdfIn PDF document text
    • https://masihpt1.com/contents//files/lixexibenawirususi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3d8ac7aee76522f7efe981b2793fdbf5/44169339891.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160876e015f75b---vimixiwokizobakomidajoja.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb461f85c---wabigemeveloxowi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f3635ba8b357e3a5976d404c6b970742/xumujokuxalofikamudam.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/fufozevaxones.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pemodifasivaro.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b490ad4f935---digubeposefogumen.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729d74578ea---33480220290.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/u23vatb5orbnesncc8mmam8g03/80536689512.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0157af2f2---natozoxozujutak.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/97ff7457efc11a930acff925db6133b2/20030842128.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9dca7bd81e8fb45e1a2af10e76490843/peluf.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9fdc86b415a53e84ccd67d2ef3476696/31332808338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=biologia+molecular+y+celular+pdf+libroPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCD 5588 bytes
SHA-256: 1bb4edecfee7ec2e272351a1eabfbe66f4027056c09efa9a3fa1df202c9d1e23
font_01_sfnt_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 10064 bytes
SHA-256: b1b0f55ad11ca4005f66efb1a3e4e4b93b42b9e25c6f7fdc1c0f1591f89c7f14

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