Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1901afcf791c82…

MALICIOUS

PDF

92.2 KB Created: 2021-08-08 08:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1c1c3a903114d54289f5eecdc5cb5b1d SHA-1: e79ba9d99c5e734281e9c46e2f440b02a458cfbc SHA-256: fc1901afcf791c82a47de9a4e22e339c380d8ee146a4fb9626904753ab4a23ca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a callback phishing lure, prompting users to call a phone number for issues like billing or security. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggests an attempt to download further malicious content or redirect users to phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://luminex.pl/upload/file/dojix.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/482c90fc441c4c5c825666ae137a75c4/dumurazorutobifuditazi.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/87228771557.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tgt3ruq7pct1h2l0lov5rpdkhe/xomesisukisaduvuzit.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kfse0eo94ipl0lmt791fcmu0hj/27312793543.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/82916609370.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/napudeweme.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6953171d---bidoxudalurovaj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607238dce5d9e---15488962311.pdfIn PDF document text
    • http://derma-dts.de/files/file/rakulepud.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/841a99ff11f7d35842e8bce56289dd66/giditilirugotemuduwifigi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/62260197531.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/16c074c9b2f3f3cbe2cf6060b3edc929/wamorosixago.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/fopexip.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502154810108.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210702184703_0rtwce.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/tubipakekoxul.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/31396827112.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/37901867427.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6b43e5add1d12e551f6ce5bf72f2a604/jisirelezaloluno.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea8317705---kujefesurureforesome.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/1323106348.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/wipenunumababitejanob.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/33560430f9a2c159f6baf7aa64fc9c83/gujeviponazinero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sim+network+unlock+code+for+straight+talkPDF 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_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 17848 bytes
SHA-256: 7cf7d3c178b429d7df05eb5023c3f503de250328861d1f003031954600542897
font_02_sfnt_off000148db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DB 11276 bytes
SHA-256: 14f9f1d02668db226f10d149d1f18c1c06ff6aac83b0f39d37cedcae6632981f

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