Malicious PDF — malware analysis report

Static analysis result for SHA-256 db14abb274fd6c7c…

MALICIOUS

PDF

120.8 KB Created: 2021-06-27 05:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 20fb270da29de14ed29d2325568b08ae SHA-1: 9d5299cef619a73f126b569555ce1b86427187d9 SHA-256: db14abb274fd6c7c8e5d92c11c39b258b0f3d069494bacaea8fd6432891329c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9267

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://cardion.dk/gfx/fckimages/file/sidilexuzuxudom.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/g8c2s6t68j4t3pfkl7rsajbbsp/67188934212.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/17089666365.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qmj90pb81j5o5g9ln0fe3o4611/33563630311.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b24e15d4---nebeduromefodeni.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607628bb5f420---40543692514.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/tibafokovinuluj.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qiov2q50qp1jvmund9urnrg3kt/59019167205.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ic3m92i50fadj810cjjmastru6/piwiv.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/76304962aef8f78fab05dac1086b655b/6519791311.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/28893231067.pdfIn PDF document text
    • https://hse.tw/upload/file/3593552193.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/99868342116.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/45381079000.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3702689dba564177f77eeab9fb0716fb/84143439800.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/40835997461.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/79824430245.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/rarefer.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/34629732854.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061413564841.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k0bk065s63olt3tprsvv2b0qd7/51069646146.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374bbb01c5---67083606720.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nojelodufikowabe.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5cfaced7---kironibavulafiwu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e94c79d53---55829491520.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nlqooba0clm3ifc99tg04b5j40/lozagev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=official+language+of+the+byzantine+empirePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018ade.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18ADE 26724 bytes
SHA-256: 6b20f770827a80de4626365082050b33b0156562bd9fd55dfde6c134830d8bf5
font_00_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 45536 bytes
SHA-256: 07911a49187393745114de2e8acce7e00a9082af53cccb2e44437411e3b43f6c
font_01_sfnt_off000158f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F0 11196 bytes
SHA-256: babf8f42517b271f6101de11b947ce9f30f8600780db0f165842cbd0b7d55d0b
font_02_sfnt_off000172cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001bc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC64 7120 bytes
SHA-256: 48b58a52bd3d783c1156037883d5a1ee223e58fd5d8abf45567a3e0d8ebc2ec5

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