Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5306e7fde16c0d4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 18:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7046aa55502578b21ca7d3214712cf72 SHA-1: b4a2a877ea5ea60e565c5b945db2c31e8d19fc70 SHA-256: d5306e7fde16c0d47c4e634435a8b66dd6c06e3252fb13bf5b8bd4c4ce0f1dc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the links and the detection indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ietc-oman.com/userfiles/files/binasolefedipoxapopu.pdf In PDF document text
    • https://self-storage.sg/images/uploadedimages/file/sovoxoxiraxezasa.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161198705ee48d---60552684482.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/99022185757.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jopug6qkbkpks24gl1un1u75ij/muwowir.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/76438188686.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/49547168186.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/relativizoworifasemis.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085152d40fff---benigosa.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/79147084193.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/95155826989.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b738897da---jadixegid.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/nanabesin.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rafunemu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba126e163ad---61391308862.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4088ba48857c71fbebcc3fc02985b994/57449322062.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c39247a7---32264920234.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d102906c---95770038270.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a72ce797a---32229133892.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/junowunubowimo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/mipuzizukilawopagaxes.pdfIn PDF document text
    • http://chenruichem.com/upload/files/vibulixoxevujijozoregomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=herramientas+manuales+del+taller+de+mecanica+automotrizPDF 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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 16484 bytes
SHA-256: 9fd2e93fcc871e76ac22cec60b60a1b50befbb08751ccf4f80de76a4ed1eb005
font_02_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 10680 bytes
SHA-256: 7e5f3f53d45e482c6a9a8dc188f021f7525e7476ff8fe71d03fbb2f51ae16f38

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