Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fa21a45bae2916…

MALICIOUS

PDF

84.8 KB Created: 2021-10-22 10:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da421ecb04d58c149715ca00554b6731 SHA-1: 1908c4e252c9a94cd4fbf01e5ed90368b49ce95b SHA-256: 03fa21a45bae29169ebcb73dccb4c2a12e44bebd70b9a116d5a8c5abd972937e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate it functions as a link farm, directing users to compromised or disposable hosting sites, disguised with a 'taxpayer consent form' lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://bobmeetin.com/media/galleries/files/dovelifutanunepokum.pdf In PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/3113734408.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/8461262726.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/ridegarivonulubeki.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4af683839f69a4a65a14c8338e4892fd/kenenilosumuvubewi.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/madesoxuvunikujazuv.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/75472627522.pdfIn PDF document text
    • https://777mto.com/contents/files/sibijitovedip.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/gobixufapujinafujiw.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/70584730533.pdfIn PDF document text
    • https://salonrewards.ca/images/file/kujugusajatidojali.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/17928501273.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161725e71db1d7---wezaluzazogeze.pdfIn PDF document text
    • http://leeandrewdavison.com/download/55910222200.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/direbevez.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/kezararowitoropusugube.pdfIn PDF document text
    • http://ecole.ru/text/images/file/sidutexumefujidoniwij.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613907ae767c9---48952753182.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/24904585388.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/92245233652.pdfIn PDF document text
    • http://webs123.com/userfiles/file/gazuvurijikabixe.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cn4rk3bfn5s2k8hq13cgnc3d36/xofof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=taxpayer+consent+form+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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 10820 bytes
SHA-256: dfa9d8957e604b869939c57087d362b76d61c4fd692788aaf6e6fe66651d955e
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 17060 bytes
SHA-256: b9422777fbf64da6152c2162d8b2f8f5e06565b9baffb6bfdbbbb59ea1e2ca59

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