Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d73e264c90b478e…

MALICIOUS

PDF

82.5 KB Created: 2021-08-05 16:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32fccf9c0fab78de3981d03e9223277d SHA-1: c808b1298d0fd3144f682d5e48164ee7c10942e8 SHA-256: 8d73e264c90b478eace87eb8893cb08b12e8e9dbb325284857a7d943d41b285c
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security scans. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sushibelovo.ru/files/48287878898.pdf In PDF document text
    • https://semut73.com/contents//files/20259310100.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d6a323c103139cfb0bb10bcc53258727/limaseruwike.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/kekexenebijibovetipimik.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kixepumoxulerezojeruz.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/68326764707.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084358c693cd---25784023247.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/36927026310.pdfIn PDF document text
    • http://sun-eko.eu/files/file/23155193005.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/berewabegejiruzituw.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0655e50188771419e7ab07f359cb7c94/ravidosiguwuz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b17114608---55865723500.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/vedexewobudizitogawo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed9b06c2c---84859421722.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702aa6a5190---borixekarejopusipikadatug.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/76741535150.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/53164050842.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/93818213048.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/50535812973.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/57232575695.pdfIn PDF document text
    • http://www.asslar.de/downloads/rojotorevonekuviv.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/gavesajomaxemimujel.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc8556fc8---jipafalaxulu.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/duzumodusofi.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/84405191980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+v+psp+rom+downloadPDF 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 17024 bytes
SHA-256: 717166ce02b3a03f987c0061825c346036e8b31f5b8cabc69c1f9491aea721b2
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 10520 bytes
SHA-256: 313648b15fe9e8595cd2afce146bdc89402d188587dc80e5a2dbe8425cfbbb8f