Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d8ccd425a7c6a…

MALICIOUS

PDF

92.1 KB Created: 2021-07-21 11:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60b97c35ece5ef82d8ed90fc776acb7d SHA-1: 5750be998da5621e6c4a40ce1953a59cbb260192 SHA-256: 261d8ccd425a7c6ade602fa7a7a76ce70a52cf0646837d755c39b154ede10b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, suggesting it's used to distribute further malware or phish for credentials. The presence of embedded URLs and the PDF structure strongly suggest it's delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f925d6a945859f9557d21b9014576061/9506090027.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/wubududedibom.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tibexabi.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vsmmo0h0itsgquumn10v34kmd7/65933298393.pdf
    • http://stpatricksreunion.com/clients/84553/File/lojipizaxap.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/juwomotafakitore.pdf
    • https://ntct.dz/ckfinder/userfiles/files/wakurafuxewaxodex.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/dd77a6f34c1d235bb44ed3132663516c/pubuxuvatopupanogolodi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe82ce5bf---towemerodavudija.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/96392729493.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b412d8b1c21---mexodoletumelifimopat.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ce57824ec183a6766e7dbc182faa8e93/zamapifedebusapepo.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad20f39e6---86488672246.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0859b562e6---pojifexeki.pdf
    • http://insfilings.com/skyzone_classic/upload/files/vabefa.pdf
    • https://needlugs.com/userfiles/files/52869011344.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/iim0hta76sghkmn52sudu0129m/3532025083.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/37875231062be24331ded8751835a191/bumijofeje.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8607b47a5ea3177a8ea5c21b1d6751a5/4866588185.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210525181316.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/buweguwavenaturo.pdf
    • http://hongdanhaudio.com/luutru/files/sagofemixababimatukapewa.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/77c7a5c5bd629a0f94948948aa1037cc/busisapufiru.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c416f26ab---difasarabog.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f469ff77a4191530f1bb47a47d0f1716/19312793164.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+are+the+energy+and+wavelength+of+electromagnetic+radiation+related
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 16792 bytes
font_01_sfnt_off00011a09.bin
ac15b1738120c6dff052ba5e35641b5f9ef94ab4fbb23604bfb7af50b38de088
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 11012 bytes
font_02_sfnt_off00013339.bin
e26bcadc3706b35ba94fb6b7bf00ec1646811eebd9289a6554724a7f781e2ea3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 17852 bytes