Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b0eb771d94c547…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 09:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 70d75dc134ddb1c62062370cd05eb7f3 SHA-1: 93f0b167b80344e94d497faf299f915a8f0b62fc SHA-256: 51b0eb771d94c54756576610b241ea1222fe5f76d3c9be6902d5a92c2bcfb71c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c275fa41b1e---maxinifuduji.pdf In PDF document text
    • http://marcth.pl/media/fck/file/92248662973.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/16153351366.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/31211414305.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/kewimepol.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df56d25895d---15444101654.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/xinawotubewikudukavole.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5962cd4e357d545bfa92f598e93c82ec/sexepakadaxinufovet.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/10134714092.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/1fce0f69e72add897ee4d573493694c7/4493693166.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/85428612300.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/df5085d2bbec5caa8643e224b80cbd46/notixad.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ad2c6786c---49146455412.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/12595775566.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/4243980256.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/58927091df08608f6a0ee879ac096aa5/17427648343.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bab24138cd490a6646337d0929027e6e/19210749865.pdfIn PDF document text
    • https://fiordipannacremeria.it/file/52494961043.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/bakuwuwamifomuwapowixevef.pdfIn PDF document text
    • https://ysh.my/userfiles/file/6481223923.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/musigatorikew.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/36265173656.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7123e99265c2386234528dc7d1ec882a/pesujixexime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ethics+in+supply+chain+management+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16696 bytes
SHA-256: 045d0663ac91a8ec403b5c3ed1d80a29ce1ef4736e4063c7400f9b0126cb2309
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 11044 bytes
SHA-256: 7a640c112107bc11e8e3b16660d35590f4f5ccd451f53f62bc150f746aecda2a
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1