Malicious PDF — malware analysis report

Static analysis result for SHA-256 4671a828fd326389…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 22:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b277badd2f13ce017eca448ae660138b SHA-1: 6af94555b62f2dd26eabb372e319753467a79e1a SHA-256: 4671a828fd326389624924414ae95285f5e2398f82b28a3943b161f1d9b32bd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://digitalqwerty.com/ckfinder/userfiles/files/96556924555.pdf In PDF document text
    • http://epwuae.com/userfiles/file/tezamegij.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/85800191863.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/14545588198.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc74e74fda---51648562516.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/nidifunixosasitebivewufa.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/pojalidevukakilival.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/rogigafemojevokaxin.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/sevoserapurasawawepip.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/18479768216.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/forozevalowisimonufuka.pdfIn PDF document text
    • http://honda-vo.com/upload/file/63264622416.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/48347066455.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/81707635693.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/zakumowizeguromupuro.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631946644.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/75549567201.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6500e035---rifetodiwasubetoposin.pdfIn PDF document text
    • https://advik.net/userfiles/file/meserepupesiwoje.pdfIn PDF document text
    • http://muszempilla.com/files/file/fozur.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/nirokawexugonex.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4d62a046---91598096078.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/20879528850.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/36556068801.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/16733258453.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/37139969214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tubidy+apk+video+downloaderPDF 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_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 17676 bytes
SHA-256: 752cd7f6ca1495c28fa6b2557d6b49f19cdd1aa5b082f46d646eea0f30e6016f
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10680 bytes
SHA-256: 8174b494bda653494c0a00946da7f728f088d79ade0fb2e261a84a9244fa6244
font_02_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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