Malicious PDF — malware analysis report

Static analysis result for SHA-256 c573653c1b581cad…

MALICIOUS

PDF

105.7 KB Created: 2021-07-02 15:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9a6c0fba69b21159c094fed3bceb3c7 SHA-1: 802afc2cb9f7d9b038382b011d74f1ed30c6f2e6 SHA-256: c573653c1b581cad378a05f345ed9d747f5dfb4a0792fccbaef50cfaae72e143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both strongly indicate maliciousness, likely related to phishing or malware distribution. The document's structure as a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075e5e66676f---monivelofuzirozokadamida.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5dad124cced6f0caba871db1105f11e9/5149898788.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qigsm57uvrvn1iasv4v9vcmcn7/dozulilukujozutaponujox.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160859a83a2b01---zasulenesodirupeje.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/92522711470.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8scrfrt9jjvr8h1pp0kbvdpahv/pidogubirukajebofaverire.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/31441175975.pdfIn PDF document text
    • http://fittbike.hu/files/file/35042625250.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608656edeff48---92243198136.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3rhs1vesilfhe1nji4nhifdhc2/mitevozerivexolurileb.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c7k1kql4gertsuo9ho3ubcotek/gasibifoxogivozilaroke.pdfIn PDF document text
    • https://aedwea.com/upload/foto/worepizozotu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kb6v18sad86atdsbb79eau32ek/79613041544.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607121159b326---69354672985.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f8c34158300c8d94d1d5b7bab22805d5/zefizumezomelaxuxuwulo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/98234683358.pdfIn PDF document text
    • http://thongthien.vn/upload/files/gixos.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/56861558005.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/75247785862.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2lladfa7rp66dmeud590ffrb8j/60834010744.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/39630094874.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc32009fc2---38223479871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+do+you+learn+in+abnormal+psychologyPDF 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_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 11308 bytes
SHA-256: 12937bc8f07feda7ffaf3da3e24a12dfad48b670060df83a97dba1721782a621
font_01_sfnt_off000151f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A02 17552 bytes
SHA-256: 5d5164b5a2982c80bcb0f3a242f9c1c5f72a9d59ee17ae9e1d8d49ff1b1f728a