Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff451c4247af69e…

MALICIOUS

PDF

92.1 KB Created: 2021-09-02 21:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be4d83c5c9339b913d7fb4a93f897cd8 SHA-1: 149ab1f3c1c0f12a4e0ecc652f92acd0163e2e24 SHA-256: 4ff451c4247af69ea65eccde5210cfbe786ed943c331c50863bb18de2bd1add8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to files hosted on compromised WordPress sites. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161005fb07ee07---remafudomixajepowagibo.pdf In PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/54657068906.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/71178014239.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b8e5aca267cca09e3cd13b11ccfee304/25113923463.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/73413987581.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/63041672502.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xezopibote.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4488a1664e---6952435055.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/211108499551.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8085956b2---56435338335.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3babe25879---veditosixibobav.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/132206572921.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce37f541ec---14693515092.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0bb7af515---boguzafebakigeb.pdfIn PDF document text
    • http://ausafe.net/images/art/files/94707913064.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/59527683634.pdfIn PDF document text
    • https://electroagro.es/pub/files/tiwirixetidesumunirimi.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/39846894605.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/titeliduluwenegozobaza.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/67881800740.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/720f82bdba9527242c87b2d2e2c8ca70/riwesararokuxedakoze.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dcfd8079---97566297066.pdfIn PDF document text
    • https://digireg.nz/upload/53360698432.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4o6a17uitasel4vq6hump2fpoa/37989861657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=inconnue+a+cette+adresse+kressmann+taylor+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_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 21916 bytes
SHA-256: bfb72d16fc86c748dd64ef138c065a99afff5c637b1819762219d86543accfbf
font_02_sfnt_off000146f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F4 10944 bytes
SHA-256: 17f67073dc7bf844fbdc6a3717ba942752af9bc5fc2cb83431985d4079ced6ed

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