Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27eb8730c4bb43f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 13:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34da2c5b1c6f9beb3707b0a0fc8eb3c3 SHA-1: 6097289d8b01cd7a88e4b13965b64d6f95a40729 SHA-256: a27eb8730c4bb43fa10d0eca3e813bf352496a774611c8626ce29ef399658b0c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/84172791043.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zavusogomepajetevim.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/2stg986j46qjv3f7eki14me7nv/59736770326.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/mimebelibikokiputiwen.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109231606071629.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210921172530.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/xezarekuf.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/cpepv067blmljqgsgao37dq4r8/99068105604.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/29759183528.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/bipobifibimazitegajurat.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/gujaxuvuwi.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/zizela.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/27460725595.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630625588.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/sexazelozogaw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/102ccd60aeb80fb35568798daefbcf40/45795091318.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/64481622058.pdfIn PDF document text
    • https://go2germany.ru/files/file/vuromuzubobimubiz.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/24800793707.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc1b94879---luwarunekanudumok.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/29069941797.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/71011764675acc7aca78b7b2dba74c62/nutukojakuxiwuwogoviga.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0613ab65---godenokanuz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0b979f0b---24250316593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kuroshitsuji+episode+1PDF 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_off0000befc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFC 17420 bytes
SHA-256: 187620977b72d667fbf361f8f6119f00c38399454575b11967e5b1c6011f211a
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 10448 bytes
SHA-256: 62a2604173bc7acac377a1db9f9c1f4274d56bbad5e7ee7b3e57fbe28efe077e
font_02_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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