Malicious PDF — malware analysis report

Static analysis result for SHA-256 430da1d63a868c0c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 01:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c7c37c65388c1e8aec5f3dd94ece85b SHA-1: cccfca09c1fba1563259d43a50304831ddbcc8b8 SHA-256: 430da1d63a868c0c5e4e93b0f9ccf1cb56ab1b85e6b0f6b7bd6212c1067c99bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=axis+bank+mutual+fund+common+application+form+pdf PDF link annotation
    • http://njbeihang.com/uploadfile/file///2021090415544724.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a3f261e8---gikebadob.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085273bbd4e5---wunekasakisatonexapajazel.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/5mvir3397s6rebf5ohejpeqmsf/97360257812.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/323ndusu1t7u5kqctmu2gg9894/litaxomelekudapenatujora.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a37c736b215de1e12b4cdd652ff7bf4e/muzalixumoforisajebino.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/79991506625.pdfIn PDF document text
    • https://mangallagn.com/images/file/sufokate.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d79c4d0b99e---34263194477.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210811074909_c3VkZWxpYmlwYXB1bnVwdWw=.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/14295080783.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da45ecd105d---xibisadubibuvubetuveko.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af6883140e9---sigapipetosakudabinune.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/87207597243.pdfIn PDF document text
    • http://z500.si/files/vevavuvefifejulila.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/lixasuxibunuwolopagos.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/pefakonimimagosijiru.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/94991303158.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/68gte61u3touc59k961b7ptaa4/xiwufuminowiveb.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/50032454560.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jugutinuvuwogo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/552be198ac4e9535ced85f8b416924c3/15623953795.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/80406312732.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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 17108 bytes
SHA-256: d5d4aa3f8dac953e46b36def2bf65d3dfcbd02c304bae30df8ea39d86e16a924
font_01_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 11064 bytes
SHA-256: 4ee7565a3437bbffca61cf30b8aeb12d49f451ddc7e3b18f7852cd42eef3af66
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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