Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efca700ef1f5c71…

MALICIOUS

PDF

68.4 KB Created: 2021-09-07 02:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8acf9f0fc3b8e575fa928a4d493b9e6 SHA-1: 1788e07566d33989f1787164f234a8d9aa765ab8 SHA-256: 3efca700ef1f5c710601f4b2894c270a8cbc0945a5a487b2c246cb3510a1a8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=piping+spool+fabrication+pdf PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607982deb9710---41861030369.pdfIn PDF document text
    • http://sbkf.org/files/files/98701634060.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/pelujegewesuponajij.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/84571221700.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/26549353782.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/57327941272.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/tulerebadodavidi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895e80a2413---lokagif.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b147c7a9f---42099513151.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ds9tegrs566j9pirjc2j23gi20/detalirosawirozeziwu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af86e2026f---88088532792.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f314b6b819---jebovugegutinovenoge.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/50070031075.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/zafebilidimax.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085df68c0ac6---54005744223.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/gemowefafus.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaad8160b4---38739135573.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/70450902908.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-9/20210509200508334719.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/007eac220051d664a00c24b3ee063957/dosimazikab.pdfIn PDF document text
    • http://brlairport.com/images/file/fututomedogu.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_off0000afd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD6 14460 bytes
SHA-256: 1c423676d7fa73c04e7e7a309f690c52e95ab7cc563bb3f8743d2888ead85d9c
font_01_sfnt_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 10804 bytes
SHA-256: 2d738128a43377c9584c7e6bb0fa88328fe5aae5cb1bd15f60bd6c5a9c70cc52

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