Malicious PDF — malware analysis report

Static analysis result for SHA-256 22313b3cd08b3226…

MALICIOUS

PDF

94.9 KB Created: 2021-07-23 20:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 381c23450ab0f4a6e55f06903ad4a691 SHA-1: 276778d2479e1a29c8ab0f68448d1c22e7654fc7 SHA-256: 22313b3cd08b32260acbf3024ecbd6f511ef4aecdf144d3fae1212c86616cb74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to direct users to external, potentially malicious, content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ahreco.com/uploads/news_file/73446125028.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d8ecf313c4d367b01f53251ee9b8bf04/6169443965.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6edfa3601a---70550929326.pdfIn PDF document text
    • http://netflor.pl/upload/File/sijelebadewudakeb.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/zobudelavimasegolesituj.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kc12515gaug35flndfrrka31m3/64387945999.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/titufes.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/vqhomf4e9hu644d4hc5c0hq0h0/53503991134.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/verawadegijoleberobukaf.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/vojisefef.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/473321ced0fa0c9dbb2882f6f3e9fe2d/gilixebamotivasi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xisavunakokujoge.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c184ef3d---vipojupajifikapizawuza.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb287c5f1c17f4ef6ead86782ff3fe97/10877808099.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/057539293b2b1fa9b231d1a5e82a6e65/rubefolowogoneze.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/zafugoritamuximizafival.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/21035428328.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/33231c9b2a83ed2ecd703a4b3a0e373c/52334251631.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/ribuxarikapudipupikuxuz.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/82349032307.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fufazomasuligigiverime.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071399d6254f---57521430366.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f93a0c91e---30874409692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dell+inspiron+15+3000+wifi+driver+for+windows+7+32+bitPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/merunozuvalewivixigo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 11272 bytes
SHA-256: 38913fb3f78423b9cad04f31328077bbd88cad25db6a2c9ee6f04f6fde4384dc
font_02_sfnt_off000134e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 23972 bytes
SHA-256: 79725b9ca5896e68d525479b2b4fad789927494dc494f6f728e67a9f1ae29f3c

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