Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f5b13eabb3dccf…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 14:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3d8e5ecd0383dfaa168e5dfab0a58cd SHA-1: 999f12c245ec9edaa509270572fe94dfe6e983b9 SHA-256: 87f5b13eabb3dccf37b205f77be95cbe5e656c6ebd1490a4c5d11fbf01c3a6f1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456e29be326---sezepaxudokosaseg.pdf In PDF document text
    • https://asthasupermarket.com/userfiles/file/49587501906.pdfIn PDF document text
    • http://xycrusher.com/d/files/pakamulubiwa.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/nuvenonatixis.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/1672013330.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/85833585282.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/2303531759.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc063bab49---gugelozizoxo.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/28880281952.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/zulobavozafo.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xivozaromikupujosimema.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/jajamab.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/folodibuvokudetamorej.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/zeguzijivujagozorup.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e42c5a80e7f7b1f8bc15598644c55fa6/maxiwixamipekomeroxofax.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409e8fbe59f---58430056287.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/lexixu.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/48512288623.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/dobigimufi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/seziwaxadav.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/19722596241.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zemam.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fbe422f623fd426d0d731c881f0d89f4/worololam.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/49435460793.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/2438771427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hd+mp4+songsPDF 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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10172 bytes
SHA-256: d6cb251c1247e1bc4463f40bc918c3b712e398735184e33c7d0e1313cb6786d6
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 17328 bytes
SHA-256: ac2593f2f0a44bc66d6df439762b5db6c9c4270cf9deb8a9c408e4ff5d5ee6df
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1