Malicious PDF — malware analysis report

Static analysis result for SHA-256 130458f2dbab2777…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 01:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32e63e787893d7029db6d6dd8c2008ad SHA-1: 522926f3db24e7403604ef2eae33a87c4b7992dc SHA-256: 130458f2dbab27776806be3f85b6347db02c8cf289faaa4606321967ab178664
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs, many of which are part of a link farm hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/99444752874.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/84ba9b4129d69b46db124315c4d68ace/julakozijunininivu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1246cd18e---pawamarojugeja.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/31920997933.pdfIn PDF document text
    • http://planetamama.ru/files/file/24340510843.pdfIn PDF document text
    • http://vtaky.sk/media/file/zavot.pdfIn PDF document text
    • https://chptravel.ir/data/file/79889136867.pdfIn PDF document text
    • https://tpk-m.ru/files/file/megelovuxife.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/xomilovigasomug.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/xubuli.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/22776381800.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/98506217277.pdfIn PDF document text
    • https://aedwea.com/upload/foto/97461756320.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/31754698326.pdfIn PDF document text
    • http://kfbi.ru/content/file/51444694721.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/33049602693.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/r4qbrtqp2bm77mrk7dss803rl1/32520553208.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/96582152930.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72e8194ca---sinopofevitivu.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4726e01212---vuxalutuxizopakujonusoju.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/ludutobobobube.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/gilibafanodidez.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/xugixixud.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/melipuwuvelirow.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/dk3fracldaotlt91m5jf6furmh/wetuwululumarozubano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fidic+books+pdf+freePDF 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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 10412 bytes
SHA-256: 4abc7e5f72be9117cf791cca5dd12f5a5c30db13cc854124a642e3140d8d4b63
font_01_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 18024 bytes
SHA-256: 843542a0bc108f4e0c316ecd752d93415d0d568c825dd70dc4cdf56470f756ad
font_02_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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