Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81135a1a7f12d86…

MALICIOUS

PDF

94.1 KB Created: 2021-08-01 12:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f7669f2b70443b64e3c8ba3d04e5246 SHA-1: 8c9988a880f5b532fe56a0917d2a8d308bb1827b SHA-256: d81135a1a7f12d8669ef395ae28b6265bf267913912780037984ce6e39a5cbbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/550ebaa134ca325d3e29d6c6ce1eaaa1/mevovonapobaxorizokul.pdf In PDF document text
    • http://vce34.ru/attachments/file/67879354693.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/mepamusuveloxo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2671acfb---samase.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/37619177063.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/fmhqknskn1oqu7se19vnfld644/zisavaxedugewuvodapogasam.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/xitiwapuror.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592bc53b68---9810054843.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2bf1c82ab5a85607a6d9743fe24c1de0/maraposubemusakuji.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/74305319871.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/funepixolusaremegimapani.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/dubiwogumax.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607812a36ff9e---jesisavozed.pdfIn PDF document text
    • https://chptravel.ir/data/file/jozavigizobuzifivik.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b3a210389030c4d255e21954b3f10e0a/86293806697.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/kirosiduwilowogotigegu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084faab9353e---wuxikijo.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/nuviwigizogugalewavowelu.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/litifo.pdfIn PDF document text
    • https://digireg.org/upload/47548335173.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/999820036410189afa8cfc3a681344f1/38796141646.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/tovububagimelelekopuvabe.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/led2geh3inj1s0noa7sn2t0dk5/44572956179.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/31499113524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=company+law+prospectus+notes+pdfPDF 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_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 18064 bytes
SHA-256: fb3fbc0447039ee1735b7c27a79204d6a763622ef0fc3c4dcde64b6e8ff1dcda
font_02_sfnt_off0001505e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505E 11020 bytes
SHA-256: 7a581b902dcb9aca352683b38a475466c7620a574b9a13b558e270d9bd6fdaa3

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