Malicious PDF — malware analysis report

Static analysis result for SHA-256 41900d033b22f8b4…

MALICIOUS

PDF

90.3 KB Created: 2021-08-12 03:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00da43a3964cfdf2551285f13e9e83be SHA-1: 6163bcb2f4f3426c3b81bd5ec179e98ad2430459 SHA-256: 41900d033b22f8b4aa8082c0ed8c4c9e9597978a14d45d246f4d166170f146fd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or hosting malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a pattern of using disposable hosting for these links, common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://creativeindustries.ru/uploads/userfiles/file/lofibebevodikijasuvi.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6960695930927609a2c05de875b59a19/wetupogu.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/fixobagujigetujukoniso.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/53ba302046a00e39cea506ad5223f3f7/taxevafogasabofe.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/pivunexevaxeg.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/61377788414.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/17e451d7bccac1e7ec0a2638ba523aad/55463762459.pdfIn PDF document text
    • http://valeneighbors.com/userimages/resagukava.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3600c0c90---figotopudetisogor.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fokawinekivapolifuz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1c7efbfd684622ec3d66b4be99ad3693/83628944157.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/e39436cd8a6dcfbffa987667cd0e2767/pebiz.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/94163935836.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c75e136f---guzat.pdfIn PDF document text
    • http://faradbox.pl/files/file/82519158193.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725eb733443---24793062211.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1iencujqotqrhih5oato4to33j/49356565852.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/tomni4qp99nkt529km85626dfd/zepagodopofinaruga.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9be4cfc632ca732e1577b3b253ee8a2a/60514312430.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51672946743.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/legagaz.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/94715396535.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/12644381150.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/kowawaga.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae901c4075b---56895404749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=jolly+phonics+tricky+words+worksheetsPDF 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_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 10732 bytes
SHA-256: 1711c5a0d50a35fa8e0a5eb722d50a002ebefd547247bf6c417cf23ed59893bb
font_02_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 17060 bytes
SHA-256: 8662c5a6a03036cd4f293ce35c3bb90bce40ade9e83c438a6a6b61d1de9e9c24

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