Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5a97aa691b299d…

MALICIOUS

PDF

94.6 KB Created: 2021-06-25 20:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a0a092a12af9a4dd8bad24f20d2512e0 SHA-1: 01cb02281a9cbe9b78f84e456a645db9a30d0ce7 SHA-256: 2a5a97aa691b299d5580f80d2bb33293b5155ca3260b224550935c547d7d2feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://castudio.eu/userfiles/files/53464465057.pdf In PDF document text
    • https://go2germany.ru/files/file/wegosufoz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e372c0854---fuxujujaxosolezarijegu.pdfIn PDF document text
    • https://tavio.ru/files/file/laxasugaxazetakisap.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/mivufusitos.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/gilininojapigadaruluba.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/27a50287ce787f524f3bfb9d46eda922/35936715929.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a1e98a0228a5420b992e793d88c1922a/ganumogapa.pdfIn PDF document text
    • https://subarini.ro/mm/file/126439326.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/jqtsjjbtihm7pbgu5ism3clkjp/99755631754.pdfIn PDF document text
    • https://soechi.net/userfiles/file/49757173074.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/793784ed43c61ef79f35d05d0c7c8311/gakikuvefilugudejonotus.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/gimur.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bad04d634---64522187704.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/98178247732.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/8843349713.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/20640378469.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210615095757059909gstrvy.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ariv3plrrr32ihni4opb27nf02/84434753659.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c97d4ca1---7806852063.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/47715899590.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uvfktbfpi5clqm3b77qu4qpioo/49172917281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=popular+interview+questions+and+how+to+answer+themPDF 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_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 18328 bytes
SHA-256: f57bb52934091874009a12ca80a097e35ce8f473011ce8a6d473db0eb7c52f93
font_01_sfnt_off00013b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A4 11056 bytes
SHA-256: 2377b1c32f6cc9c1b846bf099e2a9a6de489735cbd03a20565dc64afe2f434e5

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