Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f59cb8e510907ef…

MALICIOUS

PDF

74.0 KB Created: 2021-09-03 23:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4966929b650fa0bf66e2b8da95b59414 SHA-1: c89be954779985e5159ba4adc6c260a5dfab92d4 SHA-256: 8f59cb8e510907ef8cbacfa3f3a797fdac66d4c39d6c785460017d0d76c61903
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites via a link farm. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=english+dictation+words+pdf PDF link annotation
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/wobagonokapaf.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/wotat.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a2322ce8---933085807.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/pazunukivinefugipe.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d672cc4c---mopijabara.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040534916f---99915631089.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/jodegivarebejabone.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/33608994383.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e657d1777c---sasemugeruvo.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/26617596247.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc7ff36ce9---terekanudulurojemitupi.pdfIn PDF document text
    • http://msiutilities.biz/documents/45430512512.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/keloli.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mlr7rdq9raolc2k8f59e00ncog/kinilarukib.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/35626325537.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/51321774636.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/57592724294.pdfIn PDF document text
    • http://kawanmto.org/contents//files/gufetamupumafexom.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5375dab55f8acabd8e5599de7ef23d71/lomalerugobuzowupa.pdfIn PDF document text
    • http://sgpeo.pl/users//file/zamagamifafadabenedaj.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/nozuzuvejavakasas.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/52937712292.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/tenigalipafepof.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_off0000beb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 10836 bytes
SHA-256: 5823d451d57a91494f7083e375b691bf3d6cdfc69a388cf8afb8a747b0619027
font_02_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16828 bytes
SHA-256: 4c854d8bf39bca65c22909f77dd7f7be8daa86239ee721b4cdee235a12f44866

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