Malicious PDF — malware analysis report

Static analysis result for SHA-256 2238ca65c2ef8335…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 05:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce06ea4cb090f072996e50a772220e51 SHA-1: d44120db80afc506660baa68d6a8333b22a90477 SHA-256: 2238ca65c2ef8335ec877d9fbaebdb4ecc5c07bebd1657d2102f3f2ac9760eaf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://melz-feu.ru/upload/kifixelejuvexapizulip.pdf In PDF document text
    • https://frutalmente.pt/site/upload/file/volavuzanokavu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc999e3d4ec---33029994055.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/q61k296dd93fsg4140evmqu5c4/mapumuguvutivuguxu.pdfIn PDF document text
    • http://sivam.pl/files/file/firinubidomos.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/mowiveforosig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62bc100254---sivire.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021080209325773499.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8832aa0767f44f70bdb8f5e12ee104cb/8548540066.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/22715866940.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/28528250026.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/faredimaberutigovewixu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e8036d10---fujupenewevabilapi.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/lomutizedonuxuvaxojunek.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121735c7ca32---padikasezogaritapawimu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e8ede10ffa9024a2f8f1da87cdc8eb8c/guwexumisuf.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/58886262211.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/vavuxodivedaf.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4e2e9630d19ee861df008ef1c0bcdcc4/zuwinapiwikelete.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nokiava7f3jginh84isb3crd87/buburatikamodenutad.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/020kc9k8kaeel03t3nta26vbe9/38517163182.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ba269a0a847e84a72fa495fdbd67c44/jabedugubasapuluselifupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=diploma+in+financial+accounting+syllabus+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_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 11084 bytes
SHA-256: 3738ab90666a8a3f2e62b46f709cc894e6e3bc87a67d7d315b6d61143dcfad13
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 17500 bytes
SHA-256: 0ce74a668c4b26d1aa0dc75bd84273a65f14bfa33f7802c402c652005b91ab67

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