Malicious PDF — malware analysis report

Static analysis result for SHA-256 661ab16d47e41965…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 18:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91d27cfc9e8c37ebe3e78073174f18f6 SHA-1: 37f6508470433fc8d90184f594a6ded0317547c5 SHA-256: 661ab16d47e4196575629acdc9b334c47d76cc53f2c4509aaf3d2886f1ddf956
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites and disposable domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect users to phishing pages.

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://smidgel.ru/uplcv?utm_term=auto+reply+free+app PDF link annotation
    • https://yocarbroker.com/upload/ckfinder/files/lenilanoliruwirugitujobe.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/xomopekilin.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/78582534678.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/22784019132.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/42145370644.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94c64c5e70bd34ddc6c133f331718155/35820288799.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_79AED762118D5C43.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/23520384034.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/32545516043.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/pusofojowuvazelaf.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/kamenapujamud.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/30977772452.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kuwofasewikikuzinab.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/bogul.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e800a7926b---gisivu.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631316066_1.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630813811.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/goruvigibuvov.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/27220093894.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tupajamefavonezixatozuka.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/kiteropot.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/vifopuzifowisom.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb43d2fc9---botiwekopa.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/19547189740.pdfIn PDF document text
    • 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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 17428 bytes
SHA-256: 92ac749644d300a3edbade1b2cf604ca6361c998330cf448003186eec6371915
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 10180 bytes
SHA-256: f222674a61e01c4d84796c8cc268719eb2764cca36558725cd7047590e4ba102
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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