Malicious PDF — malware analysis report

Static analysis result for SHA-256 92277deb6e5256e3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 17:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d558eb96a05ac22c359aadd12977d4f9 SHA-1: 1332932999d88bfe80b1fdf62905a2ecfb14ad31 SHA-256: 92277deb6e5256e38a3a55b46704d3ad16cec80b67b477bdc7e4e8a45dd28e32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://beijingxinzhi.com/userfiles/file/20210904020106_1617214342.pdf In PDF document text
    • http://dgelc.com/userfiles/file/20210909111306.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/45187897861.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/87445224747.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161396abe26861---64242442999.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/lorowozewuxarakubevuvu.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/rojadudo.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/77945727583.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935d8b18d6---24253964725.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/xaduwusodewawarajamap.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/saxuposonibubosemadik.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/31512069859.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/vipisesekadutuxod.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/nafidalimivewidixateze.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/joxifozesazivozisif.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/bojalejute.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/3083915239.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/65972333927.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ed5b7714---tibegepujujupisurenusimad.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/dufumaxej.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109051806596722.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2962e5cc4ec3ad34641aeafd8024bbe0/22758772696.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/17607474915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=build+apk+in+flutterPDF 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_off0000bd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 19924 bytes
SHA-256: 82a248e7eae57b6a1fdff34998919fd9033e751b1667bb186f4935e15eeabfc3
font_02_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10448 bytes
SHA-256: cd2f38764dd9b79d2f38ddb99bced142384a1075aa9dcd4332742bc1c46544a1

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