Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cb18c5f17e752a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 19:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 250fd590161856ae87d9dc88411400e4 SHA-1: 63736949745b690de40be98a5819526c35ae1366 SHA-256: c3cb18c5f17e752a4debf5b8ead1b18f1a48785c356e905ab5d36e24b5dca5a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, specifically employing a link farm strategy on potentially compromised websites to direct users to download archives. The presence of a 'Password-protected archive handoff' heuristic strongly suggests that the ultimate goal is to trick the user into obtaining a password for a separate malicious archive, likely containing a secondary payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070d63a5ae97---xugolex.pdf In PDF document text
    • https://angkorphotographyguide.com/userfiles/file/lakikosajefese.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10903063532.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2faed509e9a7a4435900916fb6e8f550/vuliwudalofunes.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb25448ba---lasuduluwuraverafaza.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jewexokamudumu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/11e6ff4c6f63c17eb174a424cae93721/12478157799.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/damedizumorinedubizugok.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/91214870391.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xixoninimibed.pdfIn PDF document text
    • https://ccskin.com/geektic/files/minatikodo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160955e7b3b0a2---24079272157.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1fe9924ead9069223071202212544210/30921632161.pdfIn PDF document text
    • https://lapiadinafelice.it/file/wuzepufefivibujibol.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/47393238351.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/vugonetitadizopepexopa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9e5e79afbd03cd92ee2d9d823cd2ef48/bopokodotulafisa.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b72badc15---tifuvokolepajut.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/10598537107.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160809823d9f3b---banovonife.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/5kdc7mk5s8laktmca6f8fopu76/kovozujizaxisa.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5c3e49599c2557043b3e7eb97e017216/refirosu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8efc891de8---15856014788.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/17933298259.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947863859b---66270815090.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df52e0137---kenaruxofipukukumimepusa.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e830b7848d988d3b6d7727fd96c7ea01/gumeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=crystal+reports+in+vb+net+pdfPDF 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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 10844 bytes
SHA-256: 52a6195ae1eeb445048b3813ad92b87978edc4f465b97301a62688a673f63201
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 17496 bytes
SHA-256: 1ccabef6e726c04b5df97430426b0b79ec056758d1492adb81d7219af43e7a72

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