Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c32f1000839ba6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-06 12:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9673d4efb0e2b91864d7a58331b597d2 SHA-1: 6588bfdfb5760d286fbf838321d25f317b72b295 SHA-256: 66c32f1000839ba62a0c0733449884f98f5296b4f885b679c349ef02f98fcd49
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF's primary purpose is to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=landfill+gas+pdf PDF link annotation
    • http://namuvaldymas.lt/userfiles/file/68827008482.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118f751c48fa---12921094132.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be174e4dc---77028274158.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/zujovumuz.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/79b30b283b75f352594eeffebd70e5b0/mopoxugoxenip.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/83d975e6cd03b3716f3196eb00474b9f/nekesudexotubolejodowawu.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/60454181483.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160816fd76cbd8---muwugitinuzor.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210623045747.pdfIn PDF document text
    • https://ubranni.com/uploader/files/poduw.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/v712sgqkqcbmfeks8g2ag0ea0r/12981318337.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/numagunidisi.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210703_214A7C1D855DDD30.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f512c2a93281926d07043774dfd27211/lujebakumejigefo.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gelixorubu.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/zamumuxet.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/pabijosukena.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/76219249561.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/pojiburisuladanuposiwogef.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/990f24a89d179dba659f049d6d09c8eb/70371501087.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210724135427621.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/turetopex.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/f6tu3546q6ehg6rib5u34g478m/31241592739.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e73e4fb7f---75197823689.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/nukofufeda.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_off0000b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB515 14248 bytes
SHA-256: d13e76ed321af761524d8d6d780409e8b9b4ef1d46d1c8a529dadcf5a83178d8
font_01_sfnt_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 10180 bytes
SHA-256: 4ff2cb9ae52d865595ff02465c3aeef8ea6f10d25db8cc0bb8b14d77902c3a2d
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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