Malicious PDF — malware analysis report

Static analysis result for SHA-256 663135f4708c46af…

MALICIOUS

PDF

103.0 KB Created: 2021-07-08 01:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 500b3486b7a0a4b15dc821a4f693c5fd SHA-1: 4e789db4465b3395d7e33f8bc784c5f36cd85d57 SHA-256: 663135f4708c46aff2ae75274912ca247f1a25565e3982703709b9b11805d1c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and compromised CMS upload links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43844f4182---bimizurekafiwa.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/46159630929.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/98572222817.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7424880f5dd90f4f3ddc0f177cb91634/65601445668.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/62956641022.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/novesaketuzoz.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/motug.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/41320334325.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be22d438720---50848588421.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4ed0493645db45cccbab8ebf90487f94/dapavilafafel.pdfIn PDF document text
    • http://aurora-c.jp/files/files/31328491804.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bf37e6ba079a78dbc4df966b0cf5a86/potadepubovekumojalig.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/48633708081.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fa783ad25---99023483043.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xupobed.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/27000837700.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/bumotofidesumuf.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4abe8287---75690200746.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/50ec7007e2d4fbceadc9f64b9e2398bc/kadenuboxine.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/sirabolobuzesi.pdfIn PDF document text
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/89885985205.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/19374002416.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/85092778945.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/20039191632.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6b1fcde8ffe68472ed19fcdd7a05e245/79784384651.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ktt915j1p3prqdd9g59bgianel/duduraxatenuvepi.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/kipere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+evolve+pokemon+that+need+to+be+traded+on+emulatorPDF 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_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 17708 bytes
SHA-256: aa041418ffdc0f382d96b65ff749d3ba18aba98b8a23ce4628ede16a887d7b18
font_01_sfnt_off00015d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001755e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1755E 10872 bytes
SHA-256: f9c3cffca58660ce3c45a36b3676b2b6e4007e1d1f1d83fd2324275e01e90f15