Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecf0004bd664aa4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 17:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8da769d1117b344029700359c842df7 SHA-1: 0e53378c46027b634cd3631b5fefb9dcf086a42d SHA-256: cecf0004bd664aa4cf545c1d476dbb21dc05ea14acbdf9b3405c09582ccb8cf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/108d61b9fbba4501f3f3a27fe6f3e2a0/66386082409.pdf In PDF document text
    • http://oodow.cn/upload/file/210814093002731650wfn4bc2xk222.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/59424591994.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/19074743031.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/55cfcd1a99e89b16ee715f55d04184dd/benesadez.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/43194309582.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210620172358.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611547466dd1e---95583903574.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/xododemifejero.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59862939eb---39208158607.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/rawizutoduwofilejorez.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f96fe0c38136ba562109224cca37de18/55610092770.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491cc86d26---zajofunububuna.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/37303778717.pdfIn PDF document text
    • https://marigabung.com/contents//files/46724495291.pdfIn PDF document text
    • https://kimansion.com/uploads/file/lavidekujalefilix.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/24467389632.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/konaku.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lotomodanex.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/tejosunibevexinukesakam.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/44951078227.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ff69024e---kaxagugowuz.pdfIn PDF document text
    • https://motacademy.it/file/negufutuxasas.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/98953601362.pdfIn PDF document text
    • https://proia.bg/userfiles/file/purat.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b8879d03505c5ebb715c673c4b2579cf/6995380091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+icon+icoPDF link annotation
    • 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_off0000c2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 19312 bytes
SHA-256: 4dedf9861eaf74d28efd31f9a7ea21a44a211a42cf809d062d11fc92a5222dec
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 9764 bytes
SHA-256: e486d576e5106a6898824e072616eda4a283ac7f647f861e89aa4c5ff2265727

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