Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3761cd599025843…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 19:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 352c7dcb96115a2739b2a3411a6a5f6c SHA-1: 65ef2e402090e857fa5590e6a8374ef227782f93 SHA-256: c3761cd599025843f4e5d7d8e90cff6eb1dc73379eec0adc2e25de8dd9ff79d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://b2cexpressdemo.com/userfiles/file/37645075068.pdf In PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/tejubufuridoregafitilu.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/zixififunemevezamotufekin.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/mitanupokadar.pdfIn PDF document text
    • https://berettyobne.hu/userfiles/file/82925607179.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161443a4d25a82---90021270492.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/dexivedopanewizaxu.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/20172555184.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61664746144.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e42d9080103d3c41383ebb8f2e59e406/kuxoveliruduzejapekubo.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/66184227477.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jo94rsv4dr9vfetqo48bi9t5kd/99741512934.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/ravemudukubamegupejowu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c59ca5ef---2407487419.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/82973600729.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6ecbf392dfb65866ec1a668efd9f7a67/bobulajanipetoxagixixames.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a94d8bbd6---79657013689.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zetevozokizevenoxuza.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343978e0844---77311484475.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/47511604494.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/42790440429.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/pasegivoka.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/12870278014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+download+totok+app+for+androidPDF 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_off0000b653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB653 10480 bytes
SHA-256: 0650da3fbd92130c7adc46f621be67638b9c685d1315cec8ac67aa929b8f5daa
font_01_sfnt_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 18456 bytes
SHA-256: cc7fbbe8d0093924f022aa1790aa2294fdaa1121b86db39c378116d2beac0ee3

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