Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2867608c4a50885…

MALICIOUS

PDF

94.9 KB Created: 2021-09-15 18:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5968975855ced2c5d63eb6225e01aa0a SHA-1: b55be267a23d85fb3b7ca4ab1d0ad304659aab2c SHA-256: c2867608c4a50885aa3c8b174b710bc4f73b81aebf438c2eec7afaf7acef667d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript points to T1059.007, and the nature of the file as a potentially delivered attachment suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://kerrya.com/ckfinder/userfiles/files/sanuguz.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/latakevefifi.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/pajun.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/fazigalakimewuwogezokakuv.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/51154870733.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/gewipovimara.pdfIn PDF document text
    • http://cmtsport.com/pliki/98072276075.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fazepot.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/wunopamurasutuxer.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/38595968036.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd4a3b8c2---91281657923.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/97440601341.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6a561eae32605cae76a8eaa7cc037436/zolikalasekuzexunu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e204a29218---dojowuxubiderul.pdfIn PDF document text
    • http://hmed.vn/upload/files/davaku.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/logebijamerotutox.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/119f720146847c6247642773c014928f/goseso.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8238086181.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/71071223276.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/80588702711.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/barala.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/dapudixeb.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9d2d714e---nizezazopo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f100a2630---28752729206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=streaming+film+secret+love+affairPDF 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_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 10820 bytes
SHA-256: efacca4bc9d8f1d7c8690db4d90f937ff5517645c01a1a67aac31581be46fbbb
font_02_sfnt_off00013a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2A 19848 bytes
SHA-256: 5524b3cc72d5b8a6876fbede1909dc747f94fec459e32b20b072bd660fbdd3e9

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