Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a4e1cb89d203a0…

MALICIOUS

PDF

77.7 KB Created: 2021-07-14 01:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a15f270b41f6faf2d60453e42ab84c7 SHA-1: 13bb5fc965c0fdfd17afb1e50870c6d87c899874 SHA-256: 09a4e1cb89d203a06d878f57653afe076616dd4ebf020ef1b395e97ac1a1ff86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, indicating a potential phishing or SEO poisoning campaign. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/60299b1c24f2005a44d569d321db0a31/zirozuburidis.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93867bc29---sotodivodusa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc687e15a2---majil.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc69db77f8---tejomegejuzawak.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8a23a12---babazeniko.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/807ff4b12c8d3e7732503f9e280ccb04/74259688466.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/10669590588.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d75ccde9---50007907520.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743cf54dcb4---95524114927.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/buvofunotomazifalexasele.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e00501154a1---11250080490.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/rixarukakono.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcc288051---69287107432.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///75275774557.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/fenaxerimamorijogenif.pdfIn PDF document text
    • http://nature-revive.org/files/file/12633423269.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/sajidubekegifuxi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6165fc2f---91658670063.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/83c9d33181ded3e35d62b2e8eeda62bc/99319730144.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160895bd465b44---12257284857.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/7633193366.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/20157253874.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/h99c4gt39qri7apc65pov6nlac/31503180597.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce2d84e1c0---sijimobonota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=css+past+papers+2019+pdfPDF 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_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 10620 bytes
SHA-256: a38a7b552eca3011358b6a58653503459e08fb26e44a15d5980cf22c76eff441
font_01_sfnt_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 17508 bytes
SHA-256: 104caded3ae1339000503c55d0c0420d669790b735f895a5dcc4c18da6b695c3

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