Malicious PDF — malware analysis report

Static analysis result for SHA-256 5436de846503a3b2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 05:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbd14f6ae4257a948a814e5b33d2201c SHA-1: 4528ba541b65661d34bc7f1a4332509aefd0a126 SHA-256: 5436de846503a3b2552ffcaf446dccb65c31d97e2cce662ee4fabe6d2b2b811e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, impersonating a document signing service. It contains numerous links to external PDFs hosted on compromised websites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the 'SE_DOCUSIGN_LURE' heuristic indicate an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://crewmak.ru/uplcv?utm_term=how+can+i+electronically+sign+a+pdf+for+free PDF link annotation
    • http://bukhatirhomes.com/userfiles/file/vogawogazolivofoz.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/pixekidetapaluk.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/69035848445.pdfIn PDF document text
    • http://jcpingie.be/public/files/333270234.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087adf23d74a---gawuv.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b714ed8d4---raxilomitanegexek.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/88864228290.pdfIn PDF document text
    • https://efnnma.org/files/file/38804526866.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/tedevutofaxoniredidalegot.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a46f8758834436d898c985b4b33c9655/82668058463.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/xoxonijuxure.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/tigepajenasarevikojukewu.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/81420399283.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/delezi.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/77577388352.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/72278948128.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/44605675085.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/63543275166.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/pajaj.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/022872425c942b8d820f85c0a7d937df/subugijibevupojufere.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/11813768893.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/7011861020.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3e2d6854---segilemikesokuwaxu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed6c62c95---jadugijijatufonuxabu.pdfIn PDF document text
    • 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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 10984 bytes
SHA-256: f1c96f6239df5be91360b57e5b01fe1fee0f5902c8bdf8934f5ae830a995a2d7
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 17436 bytes
SHA-256: 202d39b2e9990c30645ccebe34439bf232fe0f780d4d04905802194f15255bfd
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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