Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ca28a7fd8e5953…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 02:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62b505ca86339aed0cd9c4e119560021 SHA-1: 9874a00c14768a2553041400a3ddabaf48f72a48 SHA-256: 16ca28a7fd8e595302e3a3327d30812c4e05ceb3079dcfcfcf79dba1fe8f5775
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, including those using WordPress upload storage, suggesting a phishing or malware distribution lure. The presence of external URIs and IP address literals indicates attempts to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f2ecbb688---98173990746.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5jas5jf8c35jk5t1hvt5590eub/65602880738.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nbisvf8sd805jnubv5f14al9jp/xaroxaxorumuwuzatawo.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/82179763951.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3261a04ca8---vejidotimuzubanemiki.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa553ea9756---xidijafolamefojaxadupalu.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/58177174186.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/fapavaxufivunibinemo.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/32746366984.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/70714976049.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e4ed146bee3954bfe0cff6071370ec3d/79640591946.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/vobefaliv.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/33840417579.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/jomogosi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ff9cb168---34548165429.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6ue3ebqh6a52isnikk2dk2gk24/giwubapixamemewijegafutil.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/33091906580.pdfIn PDF document text
    • http://palami.by/images/file/ruwijinitukitu.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/e4dc79ab763279965a971ed4aca5e44b.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/29456133051.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5d9c5ea4---40573195028.pdfPDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a588df2863---tuwilovakipula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=section+21+form+6a+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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10984 bytes
SHA-256: 41e306bd568655ca81c9ec24a28f2ceab9707384ebe7e7a1b53822171a61e817
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 17616 bytes
SHA-256: d6b98b066f319b7eac5ae13e701ecd63d19c99664dec5551e00fc7e83a8df2e5

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