Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28d2fa0c513c953…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 14:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1ae4ce319b3b45e168ddebc3b6339ff SHA-1: 3bb3797ceef16520eef9c8c37f8179e5b7c9cb5d SHA-256: f28d2fa0c513c9531d149a3607c67f11a9d25c257b39721872cf7bad6648036f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c94412374---67861152137.pdf In PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/kavawirafisozolazotu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90b429f9d---85921529471.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5ceab876cdc2823ffa076233b813ac85/nakim.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/98902046231.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b36479bd15a3e92696943109af700cb2/ratukavufamusolewaxo.pdfIn PDF document text
    • http://emaaravm.net/upload/files/nizeluramiteruzonekumumek.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d43d9eacbc12dc6ca51ecf5d6bd2aca4/mefawerefiwuxufujuxi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3512ba8c---banifivur.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b300ca8d174---melewilodoxafopewizi.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/pogixapevuxeganuduna.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f0ffc1eb5ebcb92aac166735ef26b56e/gunajiwosi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082803430925.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/de66d4ff3d108504a22dff78bb06b0f2/646180166.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/13636159405.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0e42938b0---kuxefuwolafeni.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a2785a2159cee157271ee5f67eba8097/pimegifalavoronuruwomoka.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/25179421349.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/61160927091.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/bujaworu.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/fegirude.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/wupewologodizuwap.pdfIn PDF document text
    • https://egf.tw/test2/images/file/wuwijajutenugipidom.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/kusafusisalig.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/79688188719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=self+respect+quotes+in+english+with+imagesPDF 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 11332 bytes
SHA-256: df9cae6e7de3ed3e5c89069c4ebe2e211676aa65fa2d50b1759d0b7351f296d7
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 18268 bytes
SHA-256: ecfb525f72e5b951df471a35021fd6691c1631d3d0fbdeb15bc875f8e7f56bf7