Malicious PDF — malware analysis report

Static analysis result for SHA-256 9993e8e81bba2626…

MALICIOUS

PDF

107.8 KB Created: 2021-09-05 14:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efabaf6768a7a4e0effaf4e8d0baca8e SHA-1: d606e00ff86a54adc8c4b1edd1a2090257a6257b SHA-256: 9993e8e81bba262616afd5d14137c072aad49d2504723aae740eb7bcf279ade4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function appears to be directing users to external, potentially malicious content through a link farm, likely as part of a phishing or content-farming scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5790acb7279ac11edc08f5e255a62e8d/134641302.pdf In PDF document text
    • http://tizianaiberti.it/userfiles/files/32587210585.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/62196243613.pdfIn PDF document text
    • http://www.bandungmesin.com/file/jefonukozadomilubo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sawufaziziwutanavo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/129b052b67f7e9e4b553879c8d916cdc/naxelon.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e250cec42---junoxedapub.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/pp67n5vfh66gm0jg228e4bhj7c/38091103438.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/49857943006.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/90030716160.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/rimidila.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/19626708140.pdfIn PDF document text
    • http://tfforming.ru/d/files/45735012724.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/26520980353.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6477c293e---vomutabolutobipa.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8c0f1170998e877e5ae481a64f8ac417/15616393737.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/devusuzanofiketexesite.pdfIn PDF document text
    • http://stl-hk.net/userfiles/64275596871.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210803095857_a3VyaWxha2V0YXR1bXVtb3Np.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/19425584887.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/37974430529.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezegokaxololi.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/71586789695.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/64970468692.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3bbcec45a0e7aab827de2436f7d0a82/97012756675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=english+grammar+definite+and+indefinite+articles+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

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_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 26740 bytes
SHA-256: f959bcc89e89e9dc0c867f550bd22be6fa4e7dc1c2bfc2f492130ea4e4004b15
font_01_sfnt_off00016fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCA 10932 bytes
SHA-256: 5baed4a08909f86c89ef0b5c51ea2d3ea468b5a315c7ee03e92daf2309222586
font_02_sfnt_off000188a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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