Malicious PDF — malware analysis report

Static analysis result for SHA-256 29110a0706136250…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 23:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60ab8584ee7f2c8a1a58bedb3090f344 SHA-1: 27eac856890518f8c5bd30f750066bec2a2ef38c SHA-256: 29110a0706136250761290452eee721e435b3824ecf08da0d246327dcdb8097e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=free+business+english+books+in+pdf+format PDF link annotation
    • http://aathichudi.org/userfiles/file/18276183306.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/defejope.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/7645305199.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ae78127c5039ebf82af0c90525fe4157/8553419304.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/61465621206.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a1aa17d28bda506bb05c2ddb734e1504/26989326856.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0982399a---19282848082.pdfIn PDF document text
    • http://iviltra.lt/images/files/devakuwegipomef.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/49965507808.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/juruwopumomoraxajokufag.pdfIn PDF document text
    • https://kildevangen.dk/files/didisisuzonafiz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160904608a72ee---32463762808.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/94826082013.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/tefogixeletixu.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/42809207968.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/vowamepojobix.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e58a5ac3---genepasezibodoxodixupofex.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/vibeputog.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/61119627860.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0435a076---tuwowuj.pdfIn PDF document text
    • http://totoumi.jp/upload/file/48928230100.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/55876079547.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ad48c785af20bc357a883446e865cdcb/78145566363.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/69442638122.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 18944 bytes
SHA-256: 45736d8ea1c90f399378342c85617513a3795000b286f660a160b5d893cc68dd
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 11252 bytes
SHA-256: 4f69f5a5f002552f8c083b9e6c3418bd464b5e332722dd47d3a426890d1720f7

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