Malicious PDF — malware analysis report

Static analysis result for SHA-256 b450db2bdc3077fd…

MALICIOUS

PDF

110.8 KB Created: 2021-08-17 02:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 160f8c9e327a7bf5036ad7ee20bc7a74 SHA-1: 2cd8190ff51cc9df4d4b240a51fc557e36ef2adf SHA-256: b450db2bdc3077fd011466d1546e818eee02227504cffca63d54b49d6f1feff7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://kolasinprevoz.rs/slike/files/xizobunevodemuzanuvo.pdf In PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/80332636660.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/kidodatujajibuzakijurutu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ec0fce851---piwalekuzako.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a665d5396---sojorigafapiliki.pdfIn PDF document text
    • http://wjcopy.com/upload/files/76560998992.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6288cb0f5---lulonamolafebodexovavebo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/prc5qe1t9fmlq1901edmf2srir/88188859085.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/pm98e3cvdarn44dl7evf195n9u/taxogobirisuseza.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9a36d33e4828ad948b7bd1a6eb000d54/48011385101.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/10855090764.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ede78104ab77f272ebabe173837c03e7/mawuxadakineguvo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/pelagofasazivepuji.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/batalulomajefababafixado.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vetetoziwenabutelivu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/pql54u5a7lobj3cj3cdrbmej0a/21105891099.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/1482911427.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0a70c454---93826183356.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ebd4i1c0lf5t5ha9gbecbf87dh/62056122320.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b9bd25c6e---55441704051.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/660cf79ea2003f5f161585ecfc16b70b/tubowalejifufajinen.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624683130.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2a13843a00bf4b2593ba5239954eba45/dukurejubed.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/fibusipefegoxawoforoxose.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/28b63bfa48371d965391d3f1b9e51443/laxemepunubadi.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/xelavijixuxujitodomelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=arabische+buchstaben+lernen+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011881.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11881 40716 bytes
SHA-256: 984eee910117485b73b03b0c6b1cc6b9ffd9b78f7e1855cc50ab4fe7393751ad
font_00_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A7 24524 bytes
SHA-256: b9181942ab297998c16add8e0c6218488bdcc7ddb15ee05c1b490c20c0fe383b
font_03_sfnt_off00019365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19365 10820 bytes
SHA-256: eb5ce573aeae20ebc3e25b174bba185600531ce1ef9165b11ca0e110dc677375

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