Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b231faa438c0fb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 09:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c7a000c4f8f67085465742ea978dbcb SHA-1: 90eb23734bf9cc0932a6cb5ab5b7d400993ff1ff SHA-256: 99b231faa438c0fb32d7081592d897fba9235f282e052ad7275fade25bb9a5bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple URLs embedded within the document point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous links and the nature of the hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://boschvietnam.com/files/usersfiles/files/goporanaxeriletatuv.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/83b5ab0bb61e9c15d69a89c9f3a3b0af/gavelabakezetija.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/76248303786.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/gigibodusefubemetobukomi.pdfIn PDF document text
    • http://balone.net/_upload/file///vugaratolewenonoja.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/45981122972.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/najesadojemolaxovasusono.pdfIn PDF document text
    • https://arerp.kr/data/file///kokimumupaweranifesa.pdfIn PDF document text
    • https://cian.hr/userfiles/file/gobabimalitekevolixajas.pdfIn PDF document text
    • http://ukrfirework.com/images/file/saxaxinaxobumisupim.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/86270139234.pdfIn PDF document text
    • http://393citizen.com/upload/files/94977212394.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46195a84---tenovuwimujatowan.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0077abdc748eef6833f6d348e71d6704/37832981463.pdfIn PDF document text
    • http://sb-78.ru/files/file/19227758973.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901231716.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/pokironefanezo.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/rulamunopadosivivifeteg.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/57718086867.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/fewawegujovin.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/8253318203.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wonawivotani.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/80435742398.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/64256870980.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/29826501635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cis+polyisoprene+structurePDF 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_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 18672 bytes
SHA-256: a6d198b2d099c62ce6047f3366b07e4a8827884d137a9fc38501e3cff294f2b6
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 10448 bytes
SHA-256: 678194606baed45c0a6187f57e9c7e5aba034ca136beabb7d95184925b01aeec
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.