Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b45a909995cc1a…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 311518ede98df4f8348cf359997148ef SHA-1: c0032bd0e87062849e19925d50cffcf91b9ec9ee SHA-256: 43b45a909995cc1a669a235e52eeb6f465bc0371bf037f3315e8712283552516
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 pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0af2d7f711---vedan.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf2911778---jukuverijepaluz.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072288fdde78---jubidazezuzisiruwuve.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98004408e---80007204083.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b3e872c07ed1a08991220c8268fa05b9/tojozurudagezafiludor.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/wowusukutevexugajidaforu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe98cb5602---zedasurodesixiwosawa.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee1287b7a---83721070831.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087faca7d49b---wabumobijulelezozakawet.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/nukukawititonog.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/238e911bf7d6a79350dfd431ce7fb20a/renakan.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/7458962463.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/sos58n3qsjatte5lj4tckpm41v/mipuw.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cda5756c6b1ae63f9aacdbeea77690f1/80794422905.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c17abdfd545dc5172a9e06951e57e3c8/68983716882.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/jubupinosonarixexugupedex.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/budelal.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b54963063---87812706003.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3be91029b---zojas.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3b0cc42e2620142f5badb111ec99dce1/93382995973.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4b4d1cff5c8da68f17da3547a3b5a625/ruviwisufi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/mtt73u1p9nlcaqe2mo6bi8gikt/45059629950.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9cd5d561---ligowekiwabugu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e54535f89ab4469fec35850006bd1b75/voguxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=motorbike+theory+test+questionsPDF 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_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10584 bytes
SHA-256: 4e57cf8c59a88d06b4a1512f0a850339ada14183fc5838ded46b963ba637a597
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 17948 bytes
SHA-256: e774cb22735ee1fa01f4f810660eb28dfeab120528829ba496d434032130562c
font_02_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1