Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a1e7d65485117…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 13:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b65c1fb060a2e2e29ea2d26bd5caff5b SHA-1: 0bbbd204b494be0b44fc2a05ff48ffe680423bad SHA-256: 139a1e7d6548511760f8435a7a96e6638b782be9d1a9bb6aece00fedca1c0832
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=flower+dance+piano+sheet+pdf+download PDF link annotation
    • https://12waktu.com/contents//files/84767504738.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a258092f049---pixokudaburomotakubime.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/80f6dc60a8b7ff15fa2dda4b54e82722/vefukoborileguwexijebi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/h9d1o7fn4530gvecudunjlnc73/sunolozede.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/verebavabaxagosiramenob.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612940c01596e---bokewisumunova.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/53852040705.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/83368158780.pdfIn PDF document text
    • https://produse-zilan.ro/files/93130201270.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2576a8e9bf3ff36f6c7b3c11500c5857/60140013531.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/panarodofatakez.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0has3j0r3ve5iqkpp2un0gh222/javodapugelo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4adbba5974f564e8ab392cd95ef0af6c/teripejofirefe.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c7c6f52d---tumodifowevoj.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/83966436959.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/tilapax.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/13733542401.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1868a4db18---tedifarunomenurowap.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/92980876001.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3babbd9f---39048453989.pdfIn PDF document text
    • http://markone-tools.com/upload/files/95099573267.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/pinalijoxizeriwafutazibu.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/nasodugumakewenigazapijiv.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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 18700 bytes
SHA-256: 74fc5269f98fb027aba12f35e9b10c2f13dc8c54c00ab7a296b5622744ce6c9f
font_02_sfnt_off000133a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A4 10780 bytes
SHA-256: 9399a25a06dca0ee7699c770d025c20869dc62ec926e6b451478fd98e07c5f50

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