Malicious PDF — malware analysis report

Static analysis result for SHA-256 972b0fc00749df89…

MALICIOUS

PDF

153.3 KB Created: 2021-07-24 06:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73e4a87b10bcea49d6adf8f280f6a82a SHA-1: ce5d505132e9cb92ff651bc85abfbed552878ac8 SHA-256: 972b0fc00749df895dda1a646d7e1b4bfec5e2f6eb12843881cb2c17e635f466
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute malware or facilitate phishing. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/c598880424638c276e7a94adaf09c6de/22354212639.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/09ae98b349a00f7855a6254d98dc9d66/tepukularutosu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd4abf7a5---59876683534.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/buzopikebediwigifaj.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/mifomeborobojo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea0b73582---sotase.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1d9e4ed8c4eb957e21e3c259b36d9cd0/foderusoluzelelo.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/busasu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94dcce4a9---54215168840.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0a9681894fdb5d9f5aede9eb9fa902e3/4134511394.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/345b702fd3603d8d5e63aef06e675e7d/44397574116.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/sg62jkhrpofob1aklldbc0aqkj/95813133236.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/pimekajesogitusiduxowivam.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be167c36c---89060959494.pdfIn PDF document text
    • https://brod-plovdiv.com/images/68492257854.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53dad5e48---38593018189.pdfIn PDF document text
    • http://placc.info/up_image/22177059483.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/32988580815.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kevalukopexiguk.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/tipomenosizodudusodu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075477fc8c2d---45314972985.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/85606339466.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/82069812275.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/mapon.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kenepusuderiles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=leo+strauss+introduction+to+political+philosophy+pdfPDF 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_off0001f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F53F 19380 bytes
SHA-256: b1b22990d90a4702a7989a811c368adf248c6f1b00969fdacd6f90b481185ddf
font_01_sfnt_off000225bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DD3 10888 bytes
SHA-256: ab4318852af3c85ee177477ba49e3f6e009b442e89c93a4edb8e709433296e94

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