Malicious PDF — malware analysis report

Static analysis result for SHA-256 133112089efc6791…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 16:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f26d58a7732f0c1980499453b8b4e866 SHA-1: 970b0893a8be53556b93d56e285c2e1b8b210eac SHA-256: 133112089efc6791872395411fd5dc5d7bd87d38b0e36f2c0a5c20bc7bc51945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ajitcoatings.com/uploads/gamikixujobinegetakibo.pdf In PDF document text
    • http://jamalcar.com/userfiles/file/73807357551.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/85572216527.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b9ec8691---kotafup.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/potivowibuxojakejalukivam.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090515374093770.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/97223611514.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/85186981583.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210916053628.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/36125602131.pdfIn PDF document text
    • http://4bx.pl/public/file/51169111474.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/80086417852.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7069734590458e5803d55888e7b85b7/ginuluvuzomupajigelo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/85iqv66f2pl4gldi00v175bum4/togumadotuxovadad.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/42021630743.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/68032156851.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kupebizukedijowomegi.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/64902648073.pdfIn PDF document text
    • http://ipllaser.in/uploads/mupemubelezun.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21e9c5013---63097007565.pdfIn PDF document text
    • http://esteel.my/userfiles/file/72095176642.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/lezananupatujeximafuw.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/farajejixofigoxofajexevet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=curtis+biologia+6+edicion+pdfPDF 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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 18616 bytes
SHA-256: 40c33e45f4161887fb774aae88cc943f88d9c39e13b59ad211006294b4c18915
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 11236 bytes
SHA-256: 4644ab8d362480bacac59002baf3fba306999c4c3e89c2ed42ff5d9b321b5a20
font_02_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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