Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f41bbdc875a3cbc…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 12:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acd6b2a910c54006600517216cf7f23e SHA-1: 3a15806da96ce06edb67d84b9180a6d10e3abe6b SHA-256: 7f41bbdc875a3cbc14b8a94ec5cd3cc497d2bf36216d3dc2bca4e6e8413546da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through these links, likely to deliver a secondary payload or conduct phishing. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a1d40305---xokosipenolivazam.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368fc656f99---zuloxuvewizulamibaxeb.pdfIn PDF document text
    • http://portableandcool.com/files/files/gefofomi.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/66204987549.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/nikokudutobopusaximavema.pdfIn PDF document text
    • https://krossi.ru/images/content/files/nexodatuwigamonerulela.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4b13c127---35210340742.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/rijebijosoxoruvevusopegi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/39601847997.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/49655269709.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/bupat.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/55920141946.pdfIn PDF document text
    • http://retailcop.ca/files/76262573095.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/mosowupepugoxab.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sujujilomifabijijap.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/35915711436.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/pofuwotiluwomakalinisuwup.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/welakujexu.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/68239112920.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/73063244989.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161361d256da8c---74555076424.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/85650824861311d9dce149.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/penesixanarowip.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cjagntsi3lnb4ktvet54293m2n/maronexavesitivutapag.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/75862344794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=genshin+impact+code+redeem+pagePDF 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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 16616 bytes
SHA-256: 0684bb5d49a4a14ca013cfbb893ee2dacff93525fbdc98675eb9d3a2363b87e3
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10952 bytes
SHA-256: c43a861d518941f4ee12f298fbb120265a5c64e375c9812a4f43ab204dba92a2

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