Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09385243d3c5057…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 10:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c29db00919aeedd6d55959bc7b3d8c2d SHA-1: 18e1517f7a39094f5f09ff18fdab92927c295e27 SHA-256: c09385243d3c5057a56c98eaa1653d54f184993b936adc5b190e237b899d0571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/c38ec4mnsrhh2gda6obaol6ht0/bosow.pdf In PDF document text
    • http://haihengpharm.com/upload/files/53546622155.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/9726977789.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/9126249569.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161300075a2488---3788012444.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/geroni.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/piwasobegokidemexawilo.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/wagivalavubeminonu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4803f37c580a9e26ff65fc4a88eba601/nogeropagowow.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e42129492b---rejirogaz.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/96656570260.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/1060002034.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/4855786191.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7affc24ac17ec73c582af3dbf73f12b9/73834646930.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/zukufaniveropaguponi.pdfIn PDF document text
    • https://2winit.com/Files/files/8267064564.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/27199383279.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/bulafenuxurewonu.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/vefevufugusadilo.pdfIn PDF document text
    • https://panama4d.com/contents/files/24395503804.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae2d52e1c---98292818594.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/32731094862.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/47920899499.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613e64a90daea.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/waven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+your+contacts+from+icloud+to+androidPDF 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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 11112 bytes
SHA-256: d6936d207dd59e7d53c2f234e094882281503d67536258ab0104c1a91c853cef
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 16980 bytes
SHA-256: 1703e8380493b256191b16c97b4a7a95441b518fde2681788ce9c5815519c2f6
font_02_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1