Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfa9fd72c645a56…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 22:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ec5f45d57e7a8e2975733fe08c637b9 SHA-1: e1f36a9e4294ab245556a9270ec226c2caf90f60 SHA-256: bbfa9fd72c645a568c5b80274d414a1cca0f94402a08eb8accf8bec686ce52cd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised websites or disposable domains, suggesting it's designed to lure users to malicious sites. The presence of link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://redeyeldn.com/userfiles/file/21773030695.pdf In PDF document text
    • http://bebsulmare.com/userfiles/files/35562328608.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd1a848c2---51181298724.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/42f7c3dcb62074a7c62b51138963ea9a/mizedimosusevekinixem.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/repokajitupetiw.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/83937036964.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ibsa3dmkb4mthqc3khlm8nk0jk/lokuxeruxawunexetak.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/wizuwaxudemo.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/fofevufer.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161450862c310c---fewevap.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/78232520500.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/65774294929.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/601cfcb6baeff4028bdf5b3a3eaf5c7c/vovip.pdfIn PDF document text
    • http://adice-area.com/pictures/files/31772014010.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/32620228067.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/42402779511.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/97176610458.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/20639971916.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/patamusola.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/11643976170.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/73265441943.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/14802126613.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/xugujasoritufebog.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/xerosom.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/botexuv.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/19723305523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=2g+3g+4g+live+tvPDF 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_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 9968 bytes
SHA-256: bc0ce255a3f81043edef60a01be956bb64e2ebcf41b740e490571f9ba066b55f
font_02_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 17988 bytes
SHA-256: 417e39699b4563b6b4657fca0776f6a5489b1c2f977fdbc8039a7380ee5ea196