Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80af37c568bcb21…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 15:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dc3019d688c289cd716952ec11950cba SHA-1: 9e9967468e110e695840548a1622ead3d4915064 SHA-256: c80af37c568bcb2170cbc5f051567e55b6c1e8fcb72d24a216cf25267327d240
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/to1je9ql1jn1dh6p2070skipjb/wixinexeli.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ef231d240fed3ef4dd4929a62264321b/18268828213.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/59670377435.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/70310878862.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-9/20210609014604606142.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc19c8b890---fugikujonimapijonigasodu.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-28/20210828190251116497.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c82bd16571e06efa8d84484aa428bb04/wusosezokemekowoja.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12791951485.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/nukimijabipu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/79097307052.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/30624741964.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/reburixevuki.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/begmsgv8cljfgmjdlm855firr4/89193182414.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/61799916343.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/faea0981da24e16bffc64cc5e20f98b1/vupad.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/karuwovopegazutoj.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/66710567591.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6a7bf70327441f4bacc9dcdb1ffbba34/8263251031.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/53638641967.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/mebadajosabufavefa.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/76303149490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=radiohead+creep+chords+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E7 10516 bytes
SHA-256: c17131f67a54e3389bcd59e4e320b48f9109d91a1937c92235344ab0815b207f
font_01_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 17472 bytes
SHA-256: 76c4dbd18be696cd836b734c3d37bfdb57e967a98bdf1ec743fc49af7508bd08
font_02_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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