Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e9f0fbb5fe3590…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 00:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d659cd722f776eb06402a0727dd983a4 SHA-1: 141bf7ac1f28d6ad995fda7da710169170eac1f0 SHA-256: 08e9f0fbb5fe35906ca73f100b2741c3cdf15c5cc660dc0538ca936f4fc72d0f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories, a common tactic for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ncsccalgary.com/userfiles/files/xawoxalu.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1f64bb56---latosonakekodur.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/31747187216.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/wufufipusipoz.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af88114ac53---93720842.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097870feb085---nexijukese.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec57f0b96---39031997196.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccedce3a4---95346221962.pdfIn PDF document text
    • https://superpart.com/files/73985311707.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098db6877565---47941772768.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/49753481070.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/xafadaripupazatawinogogik.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5il3gfol8pq7lso5eia3k2emc0/77296617845.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/98198942637.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/38162467459.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609515d117f28---loselimaluv.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fa5f3af9f62c8535bf855dcb6d3cabc8/68893616627.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/xonobogaxunol.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/duwagogi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2ca6ed55---726498811.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pemovidesetikidalik.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/xiwowigabibudekesuniwulo.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zegatapokilelobizimebizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ct+scanner+used+forPDF 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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 16372 bytes
SHA-256: 1afa140c2dad3ab49de9427ac59fdf67dfd9c70c62745f3c58ba090064b92670
font_02_sfnt_off00012584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 10464 bytes
SHA-256: 9eacb6ccd9dc03cf65a8b1ab7976e270d085b4796d8fd4475032a20160f929de

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