Malicious PDF — malware analysis report

Static analysis result for SHA-256 762fd78249d5bedb…

MALICIOUS

PDF

88.2 KB Created: 2021-07-26 23:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: be46625302835cc21ac9f9118ac4f773 SHA-1: 434e3eef4227a21781ccd75913e15e4fb08b3841 SHA-256: 762fd78249d5bedb08f4a0d5c1a1f1c9db31e0f42e82eeac7e39e55f82b08078
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0295bf7c8---8586676813.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b89f6caf4f3c42e7556d1313969f8173/jezujaxibozevediviwu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a939640cbd3b94abf2806e1fd4b73751/visetenavil.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff211a1b8b---zogemizatojutudoxopidixad.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jetokavifobuvixiza.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/flr77kl26jgc83qpchkd79kmg4/lapunetedudasujekesuti.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/xuropod.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/65436810074.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4056d758c6---fujizulowupuvidewixubul.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/gigaduxojemabokuxateror.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46789c3b7---valuxuzub.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/finimite.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/08/5026524368.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e71c7e34828ccc3f1a25ab1c7346894f/54825552833.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d1797ab82087c85558326077da489fe3/39629256539.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vddrnjk0jgjbojl1tj05d5i136/51992649959.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3d61f4c5---paduxomulixoxep.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wevawowezeg.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pgc0srhvv2aoulfl4ugikhpfo7/51318500116.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6a4bf6d2c46d2c9f9cacf5433200e9fe/36472251146.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210718_3544325E87B00D9D.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/17215448602.pdfIn PDF document text
    • https://designclarf.it/file/pivejosutar.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/9mec08b3jdgsqqk90ob0ac0a13/ruzagin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+describe+listening+skillsPDF 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_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 17092 bytes
SHA-256: 9fb8f2fb603549f62a8de4863a618350f898d23ee58ef731cf31a31ee13fa4dc
font_01_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 10692 bytes
SHA-256: eaf9b68c08f9dab707aef12ea078aab9bbca6f27b0016f9b7f50cca3a176c9db
font_02_sfnt_off00013a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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