Malicious PDF — malware analysis report

Static analysis result for SHA-256 3990e14fe47b336f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 14:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f870a31120fef58a4473bb1552d0df7 SHA-1: ec37403b5cf0906392a421323171b2fcc5ac0f4e SHA-256: 3990e14fe47b336f097c5d648f4f303391afabddf01107110ace5f5b79e3d5df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The URLs extracted, such as 'https://irlanc.ru/uplcv?utm_term=pubg+hack+kr', indicate a lure related to gaming or potentially phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=pubg+hack+kr PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f11a6a907---7073911172.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3b0440e0---62224149797.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/36895669672.pdfIn PDF document text
    • http://tayles.com/uploaded/zopovamomawerilitupoxi.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/minibat.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/95130595380.pdfIn PDF document text
    • http://hoachattn.com/image/files/60806901293.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/tunuwininoveradidedejefib.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/pivefiw.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1422f2c0---22869031611.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/66983388816.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613914238b907---12555619833.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/xigub.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ba8724d290cc5168bdec9361403a9174/tigodaxasesukuguli.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/80355935619.pdfIn PDF document text
    • https://12shio2.com/contents/files/zadibanuguzidenun.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/97444014352.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/batev.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcb7e5b18---32237748951.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/15269958621.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/im04pfo8pkajcp2cva32in5pi3/13596765465.pdfIn PDF document text
    • http://kodemari.info/data/files/90871350944.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/xorimomexomamuvuxi.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/35386843752.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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10080 bytes
SHA-256: a9bdd7864e9b759fa71b03ce3454baa3ea87e3ed5315328879ff5d8f10ecec2f
font_02_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 18220 bytes
SHA-256: a07ffc062996dad6d53c31cf129d3f9a8357d13a971f22ed20b887e61e60438a

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