Malicious PDF — malware analysis report

Static analysis result for SHA-256 811c8ab51551dee6…

MALICIOUS

PDF

111.6 KB Created: 2021-06-25 12:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 61e8a1af3dbc514a95f9475498df60f1 SHA-1: 8b0fc12fbc1ef7200301d4b4777a9f9c7e80d5fa SHA-256: 811c8ab51551dee612d845a05f675a4e3ed0a40778eb97e320c38d25f0bab0fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=la+teogonia+pdf PDF link annotation
    • https://gangnampools.com/contents//files/57251887530.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/piregude.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0575e1732---91834318254.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/41071337c799cb3c56fcf225a557bb91/42370818370.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4e50f759---pujugarusagagobulinav.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/89041262144.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/tikidazatirenozunazodopog.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rizanoxilogak.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210528_926B37A942DE91F2.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d78e0ff47216cc56330cb4fa08360c6e/jopuwofa.pdfIn PDF document text
    • http://france-ex.com/919409292.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c374735d0b01753b630cecca66fcd8ee/tezev.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788abc1cff---nixevuvigizarow.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wijivevete.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r8tlvej7pt96uuo8n2pgnct4le/batebarunurifaf.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_off00015008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15008 10316 bytes
SHA-256: 5acb850bca9e915c56787db1f1c180b638af63ba9e2a31fb2c50730ca1ed636d
font_01_sfnt_off0001672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672C 19700 bytes
SHA-256: 31eb8aac36257ad938a1b1df9ab01fa5a06c9d1b0d4ded4997651cccfbfb0b40
font_02_sfnt_off00019884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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