Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01ab5e150b83050…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 13:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 593cd1d127d6c3024b92d9b7338659e7 SHA-1: 1681bd66405ba8b54d680fe7798f2afdb3d95e5f SHA-256: c01ab5e150b83050ded614ba5ebc5bfcb0fbe5d4836d0b5c4a83b9f1465f1f51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrusted domains, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gameadvisers.com/js/new/fckeditor/userfiles/file/30743107693.pdf In PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/pututavadutemexafaregef.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/tetuzibaw.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/folifivakoruvukelidil.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109060835374588.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210905205305.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f0032f905248d051b35b9a0190cb69e4/foponaniraxiw.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a7da2c9c---batafaxukebegis.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gevajagujiba.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fofoveja.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/baguf.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/podufodibokilepovubevag.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/58634740453.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/musipevavezawaz.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/98334656346.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/69668685454.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/rivesesikidejirumef.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210902155224.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/16266605614.pdfIn PDF document text
    • http://etkenkalip.com/files/lilafobevo.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/11775408922.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee96b2c1b---59715970170.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jiwapotojuwuwatijubuxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dragon+ball+android+21PDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10340 bytes
SHA-256: 0e82aeb3f5179c30bb6d26b3fc59907b70c9c2f272834aba905760e1a7583293
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 19012 bytes
SHA-256: ea57841b975c148fd7fb86f4b7dfaeb32cda8d63950a36513d86c6ad850428b8
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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