Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce5fab3af7517fe…

MALICIOUS

PDF

129.2 KB Created: 2021-06-29 00:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab468a49660ee00930e0e868251855a1 SHA-1: eb902b79e4301af435818c79a04a25698b77a08f SHA-256: 3ce5fab3af7517fe87ec16e4b653d71f16d769e7677452b8a8576f8aa42383c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and point to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8996243e2---75413326986.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/e77ciei2rvrvobsofnqkfjhlap/romamotipa.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d061d4ec4---sawamegitepodebixuko.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086e12bf418d---wumakiwitibivalodokiraje.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/25335593149.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7otrptrqf7g2ghhg5dbh1li7j3/zefafoti.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/35902709821.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/misizovimurixobu.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/9576051031.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfed8c8698e---nekibozodasimotabivixogev.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xumakukokesevowipete.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/24a4e19ee190e2a5fd74b77ddd24520e/85810950841.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e065052bcb---zurasavurusuwedemitow.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/889324163433bca4770150ed5a6e0df3/rakurutokalavetafizo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089419663303---64525345872.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7c85c0f0cc0f0242afc9d36b302b30b7/58195033216.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/babiva.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/s1dvneme5gn7gghtm46nmlls61/lorufeju.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c3116f360e316da142dba82ed9fecbad/83776709210.pdfIn PDF document text
    • http://fitviewer.biz/files/file/vaxixigosoz.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/2n501rum9k1civluitqosgcmb6/zekolixevozogu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d56eee42798---75662777724.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2499724c74---pajixelugegupegutaposobu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f54838c59---90953727564.pdfIn PDF document text
    • http://fructusartis.com/i/File/13398662020.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ac5f20486b3f828b5af3b1e7baba77d5/vakobuzijad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=linear+polynomial+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EEF 10320 bytes
SHA-256: 985cda26164981a398bc9a4ff0400ca2bbf830aa35dac5921dcfa50f271fc6fe
font_01_sfnt_off0001961a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1961A 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off0001ab42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB42 19960 bytes
SHA-256: 0cda7c185212ec1200b45b0b39ddd6907b3c68f6c8a5eada9b04ca1e645d9785
font_03_sfnt_off0001defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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