Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9f9b4a751187a0…

MALICIOUS

PDF

71.0 KB Created: 2021-09-10 22:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c772621757197437160a55a6fb058536 SHA-1: 64f4741d1b992a24f5a78a2e00c8ff4f723c011d SHA-256: 8d9f9b4a751187a09ffd75d202ea83dda1c4d2f76ef3da81495a86e08bf452ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting and compromised CMS uploads. The presence of external URIs and the nature of the link farm suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://nomylo.ru/uplcv?utm_term=aplicaciones+para+ver+la+tv+en+android PDF link annotation
    • http://sibinetweek.ru/userfiles/file/filofivotafovepib.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/tomumifedosiviwa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e32e1494---desasusupuxafuxexoselaju.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/tenigenigutobazoxumiza.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e629da153---getopodijobojunin.pdfIn PDF document text
    • https://cargobull.cz/res/file/pesukoxuxuvunutada.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/futudaluw.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/dedojagezusowevikej.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/koxewamupomunesodu.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/85879483373.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/34440471090.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/88091507481.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/jezowexigosufu.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/karudamulinofupisarofe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378260876d1---nifez.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/sefuwegisurolozikolukepog.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/sotufilogikegezun.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/97461941540.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/44561161037.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jigapewawegifowexirudut.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/79572409450.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/tixezuwobadoti.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolasesoviwinosixegu.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/sodawasasuduwusakupije.pdfIn PDF document text
    • http://marketingnews.fr/images/file/ropebafatafibezasanexum.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/080453002149.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_off0000b667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 10556 bytes
SHA-256: e6e9a7e89332868a18369da2e716b5cc6b36b9ef90dcad8d34c45368220ecf0d
font_02_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 16272 bytes
SHA-256: 3830e75e72344cfbe2a4b010c1c874313b1a9f9056ca2ba6a808efe6ddbb33a1

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