Malicious PDF — malware analysis report

Static analysis result for SHA-256 d050bdf2b4de08eb…

MALICIOUS

PDF

82.3 KB Created: 2021-06-27 05:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 755c7d19af08c6ed8b6d8da456f50c65 SHA-1: 1522c9b26223d8e757087684e8812a565dd8ce62 SHA-256: d050bdf2b4de08ebc5e60296486dc569822905ed0ea3830145328063e279ab66
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which host further PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=weekly+study+schedule+template PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3db9216f---kutatutisenidi.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1fdaa2c36a4f77e5039f898d186f4420/vubuko.pdfIn PDF document text
    • https://kopari.hu/files/file/gigif.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vl5usj58buohfaas663raott90/koxeluletorirozazut.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/87910174883.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160757498272b7---86865917851.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/33541302870.pdfIn PDF document text
    • http://aven.su/userfiles/file/35351718479.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/jilolisofokavu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ad923f8b91795676106dfc5caaecf0ca/misiwesiderukogolidanuve.pdfIn PDF document text
    • http://guowangcable.com/d/files/pasezixaberonu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bd2edfcd---kebunexomudirepabum.pdfIn PDF document text
    • https://actorconseil.com/files/file/79478647296.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a1cf9160f5526e8934657c6d0863499b/24803564509.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/evebiloxefavesejatufur.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/24253622407.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/81599606725.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca55a17a81---zaxemu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/rufitubupexaxaruzemojem.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e20f11154---mojexoruposofawurakikoxi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210623_8BB0EFA3320D1E5D.pdfIn PDF document text
    • 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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 16584 bytes
SHA-256: f38aa3d293dd0f3d267dc91884707f2c4546ee33a3c5d04e9b2c557f8e7077f8
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 10664 bytes
SHA-256: 7f839cbf606b44259e8a71858f382882ce674d20f6fb28b76289c114353d51aa

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