Malicious PDF — malware analysis report

Static analysis result for SHA-256 c580bfc45636a2d5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 21:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2cf1cded015786d84560193daeeb17f SHA-1: d26e2c45aaaa35d0e59d32b1f1c7bfc7325f02ec SHA-256: c580bfc45636a2d5e12dadb591592e3b2be419284e93c8c5bd9d5c2a24ecef34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chcial.ru/uplcv?utm_term=phantom+of+the+opera+screenplay+pdf PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13ba12bf3---53319109389.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/3257495482.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xopadegenigamerer.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///74866584613.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/c9e8f95op9ua2ts7ghsph30ur0/mokojesegevuvetu.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/xifevijamirolizirimo.pdfIn PDF document text
    • http://isgsrl.it/images/file/ramanabadumefeweni.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf70f2715---wafilimuvegefakagorefew.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/fuvinikezoxameme.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/69982898046.pdfIn PDF document text
    • http://industrialdevices.in/uploads/motaferika.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/40712214228.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a37e6aa87---jitomiregudilave.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/41516744406.pdfIn PDF document text
    • https://palet-school.com/files/files/karademelit.pdfIn PDF document text
    • https://plasy.com/uploads/file/zorozemetebawujuwowegap.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a054185fe3091726943f9c32548046ee/11778452549.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/dfd13f6cf638fc517c868cc38140e80a/472685033.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608545f557c90---51752547126.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tu5t7a5t1ebrj7b19mtee7gn48/25013393265.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d801835d4bf---sukadi.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/lovigi.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/laxozafonekomegit.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/mekuwoga.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/69205939596.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/mebogujuvefivobok.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/6098479484.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10908 bytes
SHA-256: c69e6cd83cca3db767b5411a9877e5f2970e242957cc193c41566e1362c8e443
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 19168 bytes
SHA-256: 417b9e9560bf6a00f8903fa88e94bbc9b5e4b71bb6865bbad7bdbe9be7ae1ca2
font_02_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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