Malicious PDF — malware analysis report

Static analysis result for SHA-256 6586959f06725b0c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 10:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d1a9636ad45bc2146dc303638ecc931 SHA-1: cfbb6f003415f67d11c48fc698160e09f05614e8 SHA-256: 6586959f06725b0c436747a80eee9fdd69147c539a499795bf2695ac71cde738
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 CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm on potentially compromised sites supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gpmpoolandspa.com/ckfinder/userfiles/files/64072284738.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160966649df4a3---86322948877.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6gp59qr8dr6e1ddlvumrq42j96/garafokikugezen.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/44807269265.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/10618726316.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/bijunegifope.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xizafosil.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/87166293494.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1ine4lpmvkprmte2sns69u0bf2/43471089771.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/ladubupisifukopotupirena.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/93004421909.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7e1f3da67591f0b6b77311b5d7b4720a/ramoz.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3abc8e2e---51642327501.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/57781364255.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///94785755219.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zezel.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46e83af50087a7c0f327ef9be6e1e38d/83384041397.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hfe598qjfdqeaulh1c8s28bvf6/gurunagevezom.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/nobiporetuwetokase.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/70812715465.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/piridixibikifuxabawa.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/petojusa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/10307938944.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/97909281744.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/goziledipivaxunikit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=complete+predicate+and+simple+predicate+worksheetsPDF 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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10988 bytes
SHA-256: 42728dc148bb36b68c2d61d2fa04395239875ae4f4882b1eb0fa8fd824d2c8e1
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 17180 bytes
SHA-256: 2e47e735c1359718823adf1dc8b87ca555e4ac57dd3596b66f9e41701b95f918
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1