Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2bf32bfc254985…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 19:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f529b72299591f869149396ad08e5609 SHA-1: be92372476082dcfbc5477ebfce24d00af2bb3b8 SHA-256: 6d2bf32bfc254985b20a7aeb51a551540b0f6fb949c7c8598a9dae571ae09b40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as phishing or a trojan. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=data+modeling+and+design+pdf PDF link annotation
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a42a1b379---dobisufaz.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/tixoniwudidaruxezavo.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/lowirokofolupufo.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/bikagawarolarawud.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737cb2b0a4e---80049617079.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///65368833772.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a870e1d74---18495672976.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/luwarasagotenuruwef.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/zanoxadinikujokadugi.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/70505304830.pdfIn PDF document text
    • https://stopserv.ru/files/file/balarozesadozup.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/lasadasusaxug.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/58140654940.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210821_033221.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160927ce997ae2---5452705526.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d187cc48b9e---30314172869.pdfIn PDF document text
    • http://splogservice.ru/content/file/sujupugire.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608be03052e0e---tunitukesezimidafiniwore.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/70347250626.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/1802085291.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/ramenuwirokowo.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/wibosekiwenipoke.pdfIn PDF document text
    • http://nensi.si/upload/file/98439740398.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/85736919324.pdfIn PDF document text
    • 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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 17432 bytes
SHA-256: fd6145b294b9730851c0ed0fd1b3d55330ca04a0294ac9289bd6ad187a04a2e3
font_02_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 10744 bytes
SHA-256: 046f3c006dbe1ee4879b4f62e97b152c4c847e42d4c3a962cc1ef5065712ea68

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