Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb074c48d1cbf06…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbb41f10ea45444f67ff62a754dc18c3 SHA-1: f655d657dea3368e23d709042b85c9fad99f4889 SHA-256: 0bb074c48d1cbf060c630d6f77699dda591115ff0a4b85da1fee57cf0db1e186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thanuyentea.com/ckfinder/userfiles/files/bagugazegerofebaf.pdf In PDF document text
    • https://chinese-wall.tw/upload/files/pemona.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/latofazowowefujibuvavi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ccb4e9ae---8743949095.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/vonowak.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/rawufolaxabo.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/91901693169.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/94078908550.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xazesexeledo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/mujidemiru.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/9915849720.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273b3ebcf09---tagagapegovivabifi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c1769bd16---94109743791.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/41298838831.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/67592500408.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/o9nnvs4sibj0a83rfp6c5hc6ti/pivimu.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/74686857043.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lknpo5rdnt0ebc4bmhu25gh7o5/41117721198.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8fc8b9702---nuwiwakowowuwetezitelisap.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210621085231.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/tenapikixafozopaxiteto.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2139000db92f24bf2340187abb1815c/48042735443.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/d637726f582dd781cdcc7164bbf39f89/85903497974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=qsc+gx5+amplifier+manualPDF 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_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 18536 bytes
SHA-256: 0510e09b0d52245a049b1e617ff96b4e7fdee39bcfa3b83f8764e7325c33694e
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 11000 bytes
SHA-256: ce691e3d9a3babbd4a5451dc7bd00c3e89f4a8f8ace456cf071d3474b223f0aa