Malicious PDF — malware analysis report

Static analysis result for SHA-256 4198ad69e43376f0…

MALICIOUS

PDF

99.6 KB Created: 2021-06-29 05:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b38caba36326a612fd24bed861542e6b SHA-1: 19d7cbce84a64bad3c28d6fe9da96fe3e264f38d SHA-256: 4198ad69e43376f008e06c80349500ae0d4ee0b463da34e676bf4837bff5fe0a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e11f523ec84b2c15f0661df8ace098f5/bijipurubaxejan.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f789e2a5ca2371b53d370c0285fd33c2/mupoligopofabozotemo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c7fc09bca---55382016422.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8oi5754cu07ij0881rb8favv53/86476727373.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08ca68efd---63333598059.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/60817504987.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cd772e41cf65c809975db5f300dcb8ee/jufafimu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b106f0080---50885125463.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608206cd6749e---kifafabonepadetorotox.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vodoxaneri.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/libimowemibiba.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/31672993177.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/lla6dnbb85m07ar9f0i22a6rdi/94435036876.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/i4dto18ijvq69i0kun0eg1dn7b/xilifofisagin.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a395ddad0b23c40cce5e59b45654bd3/wufokanodagij.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5342ea1d4b---semepedujijolizuma.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc22f6d302---48442832798.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mvjuoiv2dgkvbsoo523joo9tqf/bafawujazobofokugiporivi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a413912fc3f440b96aaf7548d60bee0b/13168346672.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f83ad5233---xetuleta.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/23701791180.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5045a2b8d33b2a48356ad7832987fec8/leremeveratawopekodebu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c636ce115e6---2462661714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=a+perfectly+competitive+market+hasPDF 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_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 17172 bytes
SHA-256: 590fe0efb1d111f6fd341babfa09de70b4403cbc48af5e3fcb87c4587fe6bf40
font_01_sfnt_off00014faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C6 10892 bytes
SHA-256: 790184f31e253fa2a94080f96a150a671fd88bb22b9762e747ecf2b377fc8f41

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