Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b57455eb5a5a1d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 08:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6fe25f081f17a22a492be193e8cbfd10 SHA-1: 7322dff40cbd6b06a0bc56238d00ee13b900d4c1 SHA-256: 13b57455eb5a5a1d8d6ca2dfd0af4a5f3a6f8c74c038f5e2f95fdf7b0ac69b1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which are hosted on potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://zdrowejaja.com/Upload/file/jorijekedez.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/punelakubo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/79rq91gfe749krsatm5b5e5q02/76818199374.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c9f263b4---22372790143.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/84771715006.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/tinalutifusiwivef.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/1173880043.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/59647045744.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613475f50b502---85407406203.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/93005556441.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sobelo.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/19203318142.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/dafilusesagefibawijirowux.pdfIn PDF document text
    • http://aimic.com/userfiles/file/12995718459.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/36471812252.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/gunisuzegojinebesimewatu.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/70597593868.pdfIn PDF document text
    • https://ienter.bg/files/65062021117.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/18892250815.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/57301510376.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/wogajalulagobe.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/21270954686.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/sixuwogo.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/gelavisomesuzadomuvi.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/petegawamuzona.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/perowumaronofobatele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tim+grover+relentless+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_off0000c281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC281 17440 bytes
SHA-256: 2b9323833b48a0df0a84b2f1818c11e23b4849b819a58524af5edcf0635501f4
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 10708 bytes
SHA-256: f750958bf5312c0b7876839835fff7bbd82dd1f95d3d04823371ae2af8328c60
font_02_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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