Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13b27077aa822ee…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 10:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef01bb06db3dab676b2e830bafed4e37 SHA-1: 1a9f6849a3789a22bedf1ce3b2edd174f8ace049 SHA-256: d13b27077aa822ee20c3bf8eaa0551e159c4a9e759b71e4594623fa2a4473b5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://akanaymatbaa.com/calisma2/files/uploads/gawutedixevepaminuke.pdf In PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/vorububovowoma.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/35843627670.pdfIn PDF document text
    • http://kmsenior.org/file/files/temavanal.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/polexifol.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/liduvivotexe.pdfIn PDF document text
    • http://infoguard.ru/content/file/81816931846.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/muvokinosajegunogazabofa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ecadbee---xawipetoduvu.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/mekuvif.pdfIn PDF document text
    • http://pasaru.com/upload/files/ramovom.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/bexovofe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ac9fa1ab615782bce7875f9fdf1a7455/xenipotuled.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/gukulowefukizanuve.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/fojavokavej.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/poroletolivelidigiwaje.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615011f7db90a---fakonoga.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/xomejototutinutelum.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/figebejuzukefiboxaw.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/severiwujipidowukojop.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/feliximovomebonikevil.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/talameponaxupon.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210904025219175112.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/70601949538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+plenix+clash+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/15082416342.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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 10692 bytes
SHA-256: f784fa7debabd34e24be7617c9b960380ff75b31ba9343fc5c629d49f47c1844
font_02_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 14916 bytes
SHA-256: 6877ce28a80d81502a40e34fef590945332dc1fcee72973b11ec858563a8d5b4