Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33aeddbc9d4718f…

MALICIOUS

PDF

91.5 KB Created: 2021-07-28 03:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c86e4bd563fa0620f390e5d7c297f0a2 SHA-1: 733aabfecdadcac2c430c7b3cc9bf17bd9d31f62 SHA-256: e33aeddbc9d4718f0641b186399c181f13042dfd7ed67a6b7f4cb2c79634dfa3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to other PDF files hosted on compromised websites. This behavior is characteristic of a link farm designed to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/cbe79184549a4211d4b86ef4c11bdc0f/jumafobegurilil.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/zenebudozadeninojipufo.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/66278560515.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jokisumefajemuki.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b7000d91eb71544e4b018dbf1d9496a/79383211036.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/93028583685.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/46c7bc2adda8ce124136289250997e3b/62961475229.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d545fb8bd9---saxanusuwareka.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/joronesinivosagevetuvob.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/84hn4sgrbbjb1mlkudgq62jt61/48036872970.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/360eb2f7765df2013d64799ed5580c81/92044970840.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/51cebb3e12314fae6407055f275cd022/51054039827.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609490554a13c---36518797999.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609448b0a5f19---26018992681.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db8d5883ee3---65616008107.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc125b7b8---62211915731.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9c7b457b9da0eeb085601d04deca7196/57300435225.pdfIn PDF document text
    • https://egf.tw/test2/images/file/womibavuguvurekogepakeg.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/mafavadinunukame.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/19cbe6048413fa483f70e421069ffafa/22235835810.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fukexututokudof.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210610_285865F5002B13D2.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/59860897577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+inverter+12v+to+220v+1000wPDF 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_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 10584 bytes
SHA-256: 84d7294b7a042633a3a5d488c6b57c807a14220b9585c2baaa4f9140380fc636
font_01_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 17116 bytes
SHA-256: 26a96e6b16340ddf64d91f771e06870c35a064eeb13de90e1f4832c684450c8a