Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e0984e23ee7fec…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 04:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af1658b8f81ccf3756975a587158759c SHA-1: 073a5ef372a630140c3c13f246fa3db1a776cf19 SHA-256: 51e0984e23ee7fec4c91b61d97d6e1677f8421f9c7ba9d5414015fcfe8fd4102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content or phishing lures. No scripts were extracted, but the presence of numerous external URIs and the compromised hosting suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160833c10c4532---25403695408.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098318f626cc---goban.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/352b9ba9b3d538bd772233a5bcd01324/tokokimenexomuxodimopa.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/86502515393.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tkdb2ftvd75sjtg19kf5ei3853/77824222764.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/degaletibusirobud.pdfIn PDF document text
    • http://greenbrier101.com/userimages/zudusofadujanusebob.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119915295d8f---damuzupekomugovojebubi.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/56511438702.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/4433092206.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/pevaloj.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wobojawubabejenu.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/58173639232.pdfIn PDF document text
    • http://houselandia.ru/files/fizemarogaxakesulan.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210810053150.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/bowimapome.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/mojifixun.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/084463ea74469210d49f94f8d95433bd/63442925622.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/gizabedumunoketawezatesuk.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/839e6320e2f1bd5ff2527e0e9b8ec957/36629395928.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/727b02f4712d5873b3fe2221afd115b7/12255003089.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/lolabixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=high+c+personalityPDF 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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 10756 bytes
SHA-256: 7e4b5258c141c2b58be7136272a6bb9e961d8b5c1ccc50e6cdd43fef5ba5fd4f
font_01_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 16680 bytes
SHA-256: b9a772c8ec8423e401a5acfd8f2e23db9caffdd5062326a5e3d2573d523014d7

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