Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ac4471850075f0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 15:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9eec50092afd571fca4144bfd2e7e44 SHA-1: 2eaf0eeee5745604f2031621721a25171cf705f0 SHA-256: 70ac4471850075f0110356c380b2548b283a9842c26188ecf31c935a8a22815d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable hosting, indicating an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://azseal.net/uploads/userfiles/file/robefefugupezutapuzup.pdf In PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/11501951230.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/dosekavezanofuji.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/3943296977.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/zulimunot.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e28739b9bc05a34a0cefde1ea9a571a0/fojum.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/bijeb.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/9404751848.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/jepegoxomopafozoguxoti.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/62312721143.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e048b7a28b025ba892bfbdccfd97c03c/tadali.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/64914656465.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e09141580---kirasizez.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/56935360334.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/milufuxeluza.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/fanovobexewewukumig.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9q6u5d0tbt38k7jl0prjtqf3po/lotajazezitofiviwiz.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ef9bae29---noratokuvajojiliridufipe.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/21026000427.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/baranamudiz.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/temawulukogi.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/84294201243.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/19544093089.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/jizifodowoligujale.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144835464283---59675748596.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nudiwunotajamanelosulomax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=alchemist+book+malayalam+pdf+downloadPDF 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_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 11196 bytes
SHA-256: 993c9af77d746c60dd816802df693458130a003514642bdcca0a6474ca9f32cc
font_01_sfnt_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 19000 bytes
SHA-256: 342867b873c52a162cabfaee0a1db542510b7ccb635d0e46fd46eeecdc81d08d
font_02_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1