Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc66ecc2620663b1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 11:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be4c5cc6fbf3028548b8fad49e8304f0 SHA-1: ca17773ff84857c4a8f1acca87e1d196a7c68e0c SHA-256: bc66ecc2620663b18e636a9c05d8cf7c2564875c9abef59a35507c44395938d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on potentially untrusted domains supports the attack pattern of luring users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae53756a79---depumivu.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f7njl3eci3goui955plupl90gl/60313616494.pdf
    • http://tw-sincere.com/upfiles/editor/files/jibogufosodefumun.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de442770d7---19456488803.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8b006bf7---72615057068.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/47852117966.pdf
    • http://upbfassadenbau.com/upload/file/tasidugotexesu.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a891911d9e1---37466177209.pdf
    • https://transmar.biz/ckfinder/userfiles/files/27036227188.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a9268d8d---40921710444.pdf
    • http://narcisse.sk/editor_uploads/files/bobune.pdf
    • http://beautybybelief.com/admin/images/file/fujunumunoxuraju.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/70444638163.pdf
    • http://sklepjola.pl/userfiles/file/kanid.pdf
    • http://grafichesirio.com/userfiles/files/xuxabisepizejakawu.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/trc02u4l7sftecs3pmgu24u7dl/93670874311.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f4a7fab13cfb871997fa99c31590b77b/zalogukitarojafekuropaxif.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/wetifomadu.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d2fb11d9356f6c4abbaae76c101cea1/lujuribasomozigupod.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c89bd49e---vaveguxaravojur.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf60930ad56---disazufad.pdf
    • https://prtl.pl/userfiles/file/76336530011.pdf
    • http://veterani-pushkino.ru/userfiles/files/dajakiwusanadobudisu.pdf
    • http://dermalab.pl/userfiles/file/48235937112.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+decree+in+the+bible
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
font_01_sfnt_off000107d3.bin
c0511381b42d7c61be8b98e6e0c574be0fe8226e92f21a3f2348786c9d7c7a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10720 bytes
font_02_sfnt_off00012018.bin
fe3abf378acc9c0c381b53685b9d66396978e4360900c88a200356662efae5b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16248 bytes