Malicious PDF — malware analysis report

Static analysis result for SHA-256 203ca120303e5733…

MALICIOUS

PDF

89.1 KB Created: 2021-07-15 22:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f75566d8603e03a9f0563ed0ed5de89 SHA-1: e7107ef781fcdaa8eee7512e2c38ae6479c1d61a SHA-256: 203ca120303e573385193bfc0e4e4f1d4f93c35d782e30b2f579ef83646301b5
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF itself does not contain readable text, but the heuristics indicate it functions as a link farm, directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://wastran.ru/uplcv?utm_term=bedtime+stories+for+stressed+out+adults+pdf PDF link annotation
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c6ae6088fa65ada9777d0be400ceb10/jekav.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98426961960.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b254ec3a---fojowoz.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/lodenewopojunapamafenub.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pfbhof3n364oamslnrtsufuddo/48473029890.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da1dd98ef4f---zawepowaturuvipelivivuk.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/71791e4a510d29b9600e21a925852a6c/firegepawivugubodujigu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a59a6f925---86787614904.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/sutekapedilagejepa.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/zabipakakidavakeguri.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a0e3d122672b53dbc85d7e3630054104/88675342359.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cffd6f2be9d---folalaxukinizuwatekosiku.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/bonitame.pdfIn PDF document text
    • https://soechi.com/userfiles/file/21780931037.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/pawatub.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/59261997202.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c49407c458b---dovaxabirope.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d135853c8c1e8f9056d386b936d5edf1/wawub.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/mudiwokej.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f26608224d---54294957193.pdfIn PDF document text
    • https://shibbirs.com/media/files/walesubazamogebib.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 10708 bytes
SHA-256: 13465b57af88c081c09363d107bddfdc0e4f72de2d25f8399bdaa2b6c2950f62
font_03_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 17820 bytes
SHA-256: 4f7d4c7a3213f629e285436f64ed56f34fa53b94bf504afce1a8d1ec5ab1d050

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