Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb49baedc46ca4b…

MALICIOUS

PDF

95.7 KB Created: 2021-07-15 12:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7f72879aa069dcefbd7a4bc0c94dd56 SHA-1: 9c483bd4b787f3ba9f6c276a3a0cbc53f9a65225 SHA-256: bdb49baedc46ca4bd7426256eafc18e8e84598bb1784b9b6736073cb743f913a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, indicating a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to distribute malware or phish credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://crysiq.ru/uplcv?utm_term=puppeteer+multiple+pages PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5781efa7f71eb917a483bf6d292701bf/98537770184.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26828a2a27---35618876806.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/gelubezeruxanogoluge.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/69108614427.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4e66f9ee5a957f97746120976ba9e8df/dilowivemog.pdfIn PDF document text
    • http://jar-ted.pl/file/nikumorimebog.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/52a67278d1f253940f68523ed05bc14c/26959574357.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/11751253728.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sowifekodirabowiwepume.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afced57940a---vuledenufepogu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ee4c8c931f52f26f70940f9e211e332f/48688861013.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f81572bcf---95439154803.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/jifexufojixano.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a90bbb3ce0f0c49e5c45ec1038f35fcb/revoribepozo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a5q4bs02e54pd7l93jql7jduf/kezenate.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10b89425---feluzodakofa.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9ebd8467bbbea8fc76266c899eb31096/zojolaxasutope.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/213dd50d815f9a71215a8606a26b79ec/vozamawuvugikulonodoba.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a5407c12b2a19f7978f9b455a0f989bf/rifaj.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3854dfa0d---pudawubedufuwarakagaju.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/93395908336.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0d6a2036e399a508315a65848d9e8964/sikijopanovelukuva.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/furufuxobesiwiduf.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbdf290407---28624271831.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/24009691357.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/38708395838.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_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 10472 bytes
SHA-256: 4977ded8f9fe0b66e890d4d84af6feb33e5c3ec7f41037aef8cb90ceb31197a2
font_02_sfnt_off00013dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAE 19512 bytes
SHA-256: e58f65939270e95cf491ab07aadc3bd9cba110a861ef5496373bcd725b1a15bd

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