Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cd68990839a3be…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 20:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3aa450654097d8f33ae5ad678e895d8 SHA-1: a01c1d63f28cf42250f622510c3d5977b84c4efc SHA-256: b1cd68990839a3be64cc75045d0641ef6840f19907e72d9f64635d6d212c4dd8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The file's structure as a link farm is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8d1efbf75859f923fcae8bc0e1131287/98572869594.pdf In PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/bowipaxajamefetodisav.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/he4ojbh0kmnedfora46mqoj68d/vesigunole.pdfIn PDF document text
    • http://fitviewer.biz/files/file/75684474684.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e297f04260---kiregidubatidomafobal.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/kawizerefiderazudu.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/popokudogana.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611eff2622818---58239262167.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f63ee40c906b615baa968565479ad136/zofololivotegavu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/pisipoti.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e65ee31d3---nazarufasavikiromaduvigax.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5f91c463ff099794593c8f7627caaa69/wikoterukabapesef.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161158a938fe75---73640924095.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202108260319127518.pdfIn PDF document text
    • https://073741256.com/uploads//files/202108130650287697.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1e4ddfc3da1174313fe671b39ac8f6d/lewituvupavozuje.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/pokopivisanirosusiwurubaz.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/dezubibisosil.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/kunamimow.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nenatujara.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8c31b45e05708c1d4e803dab62dfb5b8/wibewukova.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/farexe.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/zozamivunitosokej.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f2d36b79---7225467998.pdfIn PDF document text
    • http://rsst77.ru/upload/files/91409500753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dairy+free+toad+in+the+holePDF 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_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 10396 bytes
SHA-256: 981f786b4990c0b3dae60a27828e1d900e9baa86dec23b68a2c2d4ec666f5d3a
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 18584 bytes
SHA-256: 6a2fc18519d343458090b92e269fc61019a5a0841669297f291d01a9a3a89c6c

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