Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e4689010620b74…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 20:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb15f44787d293cfaa2aeb2380d41a25 SHA-1: e30115bff90e45e0e4f9c90303c5df7959ec291c SHA-256: c1e4689010620b747118a2347422d5dd496c726fd77ea6413b01bc56f89f0002
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://synerhu.ru/uplcv?utm_term=nataraja+pathu+lyrics+in+tamil+pdf+download+free PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df64c13291---59601643918.pdfIn PDF document text
    • https://clinicscrm.com/img/files/kumobagidadi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f3003139408b65868698e7482cef9070/94039073424.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d3e72ee6---kegoze.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/4535290068.pdfIn PDF document text
    • http://kotolantopeni.cz/file/15785093071.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27999e442---41128047358.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gegejufasetiwija.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/gabodofokoviguri.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dc8f522505205d3156547749a1e3e2e6/dilofonus.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9a369d43---sajamilelu.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/jodimata.pdfIn PDF document text
    • http://hodori247.com/uploads/files/bugepapetur.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/10129563161.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/25337493573.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/jabitenapanovovag.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/22811743372.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e682eab63b0---35924881131.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/43e6cf82aa5906b449b59ab9e9edbe01/70755297326.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/678b284261e52ae72a8c35d20c2a5805/70187959541.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098867257d64---nidexipimawurajodibese.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e576ec1435---86622467663.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/nojajeniloxaritunivukadak.pdfIn PDF document text
    • https://anup.bo/images/files/80160525038.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/voviratigika.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/43832709912.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_off0000baad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAD 19016 bytes
SHA-256: 4f31fb70bd46c92d107fccf5e3191053045d3b9b97a259936e54f157830b9bb9
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 11292 bytes
SHA-256: 25f54bb84da0beebb9e611a4ed47d556793155c54228a9f8b58ae38ddb8f690d
font_02_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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