Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b8e6ed1b8afcc1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 06:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c9a9d1db3d8cf1086f7da769ce0632a SHA-1: 555389f936f3713643c8fbf10bd700852802c9c7 SHA-256: 65b8e6ed1b8afcc175feed04064e6980c821358afd04f79456f54d00b3cb0a16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF is part of a link farm, pointing to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thekolkatapackersmovers.com/ckfinder/userfiles/files/katase.pdf In PDF document text
    • https://abeess.com/userfiles/file/tokovodulirumumi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210713054250.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/53853066564.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/86343159712.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/38521805872.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1u7sjupn4nphrk8t4uesj5fpf2/7197769773.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/xijalobitubekuf.pdfIn PDF document text
    • http://midel.me/userfiles/file/12154697858.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/88009353433.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/jexagu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/29472125497.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/mixojimux.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/46060971759.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/bagamujidulakuwomuperubem.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/sabizasimometifapabawe.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9b983371---75634624775.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/jofeno.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fvgmolm6k93j8kv3jbr3ldo1gj/76284772848.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dusogiw.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af814c16dd898df77e4f604e6b9b848d/89566658688.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/wugofijufitapaserimil.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/fegojiliwizefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+chess+opening+moves+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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 10876 bytes
SHA-256: 69efee2839f31f1c4c153816839a4b35daab3a987d0e90660035183dca144e08
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 17516 bytes
SHA-256: 0001cc67c2854c9319695279068b315af376b1163099860902e0d4dff1a1ef94