Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf02bc906b41b6fe…

MALICIOUS

PDF

83.4 KB Created: 2021-08-03 17:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4d250ed00d976a07a75f8729b799d20 SHA-1: d3a0178bed2b008ee8fd9cce31347ca78377cbf4 SHA-256: bf02bc906b41b6fe2eb2625940fe2944ecd86bff8be49c8113f7919a9e3dd692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://oniceh.ru/uplcv?utm_term=mixed+continuous+tense+exercises+pdf PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f21c45e9f---musiw.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/gikubujafegoxi.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/kofaguxefafomemapedifopar.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/likafejogat.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fodepoliliwiforeluni.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/292496e78e9c36c69f43f83c6b099344/fizajedemomarilera.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/92cdb025f5151f1e58bd8c89286ea966/68474774301.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f0431a6bce1---valogerinune.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608174839c504---rilokigozevi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b6ssq08m4bul31snl40vm9s324/pewewuleragajotefe.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/3c35660d4c07b270289fc0ed90b111df/mumetavuwotu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96422bfaba---xidikarinimanosonisuti.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/43348835436.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/70833884383.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/zivisizufiri.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/15686323008.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8cbf82b79c396ccba8f76b9ed80556ee/gibufejude.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/fibusevigubajasowumetes.pdfIn PDF document text
    • http://bamor.org/userfiles/file/xefumalil.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/8324569860.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082380655a76---tefuzekiguzikuzosanajoxo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada4688bf4---7589887032.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/pesimemejovurogoliper.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/87845578880.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7d8a9ab1---30671648288.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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10600 bytes
SHA-256: 79f281fec989fc7b50a49b29f9ffe0787363061e8f1c7c30f4e570208fe019bd
font_02_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 17224 bytes
SHA-256: abe223e94ca51aad14063ec37c43e8e56c5d9dcbaf2acbf4b6aa69789ea09e59

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