Malicious PDF — malware analysis report

Static analysis result for SHA-256 010d9f8cee98cdeb…

MALICIOUS

PDF

114.2 KB Created: 2021-09-03 07:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08e5782f1131461b79000f279c0e3a5f SHA-1: 88cfd875d325c99ee4481706729c2120b08a3b25 SHA-256: 010d9f8cee98cdeb56b7a2eb1fd9b970c73b072cf2f5e23b166f8bda412f2ca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for initiating malicious actions. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://divorcefinance.nl/uploads//file/95438961973.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0b2fdf09f---42918672038.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/voxotetaretawetoz.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d43c3fcf3---15879886011.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c0b53e6bf0c9c7b6c5a566670cce9050/86898121596.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/39441936.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/61451383831.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/zoronufave.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/87932543123.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedidijuwaziwajejuru.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d416ac5bec---76736218202.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/13441181846.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/67626780134.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160950e74ab68c---25957277149.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/texoxopijepo.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/morufovexatilagenibu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072b41c8b071---33465120718.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/55060606209.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1625588349.pdfIn PDF document text
    • http://modero.vn/upload/files/nuniguk.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/demep.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/panabetojaseloj.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/sasalekoxujiran.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/65103656188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=boule+de+suif+livre+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_off0001541f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541F 10348 bytes
SHA-256: 1676d401428a4463e673d4317d1d489949b2d3a534f433f1cbe4db178d9d398f
font_01_sfnt_off00016b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9A 22476 bytes
SHA-256: 1f84f82a17d51562ee6eb8cb39c468da6566f7b6c79f507c02ebc233e1732a03
font_02_sfnt_off0001a36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A36D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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