Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c7be6134103258…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 23:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be1145a6cdacf955ee488536d76d964b SHA-1: 3e5a59387da6127cab48dfee834e75a1a1f34cba SHA-256: 33c7be6134103258371d63c0dce9e3817363039e2f4f646867b346d940af7edf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. Heuristics identify it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://kingcraftviet.com/uploads/ckfinder/files/bufebibadageg.pdf In PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/8a2faa6e120e82c962082bfc3fdf022f/17789767466.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/13132932131.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c6a14d18---9342399749.pdfIn PDF document text
    • https://hse.tw/upload/file/50010256120.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090324caa061---zatevitepuvoxozubov.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/44521369842.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/64033296520.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/93554173212.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/dc7949c478b1c86f306ff57ddd76a568/vibokemipisomibewoji.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/s1fd1mhmsp21t82c7pjlli1d6u/18025959705.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8baf9c24db---liligugilularudedimul.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091e7f9c3348---fogapuke.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1t7pp6515c0mnf7lv2bhgspse4/40667375117.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd2626f4b---tabavofoxiralumeru.pdfIn PDF document text
    • https://datajournonepal.org/files/64232011353.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/navodomitiniruxego.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422d8208e8---mifozunajufidolosinusoluw.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/993c17f76fc660e064573863ebb5efb9/pabamomasefabigabaviteg.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-28/20210828052837541741.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/75857667310.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/kumapesovujefisi.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/jewitabaronoposejubenapo.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/36951266825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=social+media+marketing+for+financial+servicesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97d4b9690---wanovig.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_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 11052 bytes
SHA-256: 4f87c7d6318db7537fa3ee671669e9dc0ac75081950f83e11690ee726d14b8da
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 19372 bytes
SHA-256: 08fab96fd633ff40b084855a09cf71c7e71a31771f0454e85166dfb9348c8b6b

Open this report in the interactive analyzer, or submit your own file for analysis.