Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a92f2ebbbe4355…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 07:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69fe2f806eeaa4dd416b461c854f4613 SHA-1: 1f62988946c090425ed0c29055d4728b528b9ea4 SHA-256: 88a92f2ebbbe435578d281f65423ba8fc34fd9e79575e8bb6762a352cca8dc30
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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://crysiq.ru/uplcv?utm_term=cupcat+editor+apk PDF link annotation
    • http://gaongonmaiphuong.vn/webroot/img/files/fekuninonitoletejo.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/66474674695.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/45184700826.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/v9l8a3f7ratjpsvpkebfcpm294/44518317222.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/57465324165.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/jolafedosiguvirataved.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/36184228884.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efdd74c2b5---tujitawafixob.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gepagukij.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f26e9e687d446e729459482a44b84ce2/pinaxik.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/kejejabekudazo.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/nigubax.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/22754066758.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/jowokexulopujanokemet.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/lanidadol.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/davoregewuzutolugij.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613010d32824a---33164934732.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/biwizep.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/biwijifun.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131893bf1a79---62077565123.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/suzabizafelapizixesud.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/91705870305.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wifipekimag.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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 18168 bytes
SHA-256: 3dd1b7b1672820762d65bf0bf1732fb9e1016d7152188adb8d8093a35bea5d26
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 10412 bytes
SHA-256: a061a6cfe374612bf1ee159cc9ae8545f7a3e6bf13e5579c9fd531cf3c44e183

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