Malicious PDF — malware analysis report

Static analysis result for SHA-256 f586a3e58e656831…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 16:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c323b6bb19db7eb9b4541658930db3c5 SHA-1: aaf010284b104a3b7bd07946a271820df2e0ffbf SHA-256: f586a3e58e6568312669e60af30c3ce97e087849b3de9b39f21562bd38547f51
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting sites. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://hwayinn.com/image/files/20210807_011931.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608945c83ec44---57772498644.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7b87755080c1ecb18b2569e41c601a27/85367254847.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/73170683908.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074835e31e51---18918640993.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/zejijoboziperufinovupedej.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/7039978573.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/bekikogu.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/29819803995.pdfIn PDF document text
    • https://landbar.com/upload/files/zinazugalitimurilavedade.pdfIn PDF document text
    • https://areicon.com/images/file/toxixisa.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/95220291451.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/75809560339.pdfIn PDF document text
    • https://efnnma.org/files/file/bimuzofibogekitadajobili.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b0c5abd4670030d05099232a4c683e3f/dupipurotadojagut.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717de1152fa---62663732699.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2cf9808eb2afd6b7e5124fc7e9ddad45/43667290054.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/rabagasasibevegar.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87f460068---nirapokibezifoliwebotiked.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8538dc23d5---13431530165.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea18bb3fa---55093952624.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sizesinizupar.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/kijurobosaje.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/epn6gvq2ojna4blend9f5cauat/tikezipak.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/32830154782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+printable+pdf+coloring+pages+for+adultsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 11012 bytes
SHA-256: d0915b84c81658576710f1d426f36adf91225955989805bf14c6bfc5f2292635
font_02_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 16712 bytes
SHA-256: dea56d93891997ac9093ad56f143908f299d741719d2fef4360b780ff7590864

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