Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacac837fddc02da…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 10:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 137e50b5be2d3957b20d223ecc0e4251 SHA-1: a05dda0485eb53beb6fc3510fe294f21861022a5 SHA-256: dacac837fddc02da4a2633816c784c216392fa3b2be615d86ee5301810ecbc67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing pages. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common method for initiating malicious actions in PDFs. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://candientuvibra.com/images/file/tobanarebawisi.pdf In PDF document text
    • http://thebankcardservices.com/uploads/files/wefajolidapelibuv.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/wazexuxepogobibapopo.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/xunagikezogefisezuf.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lagl470h33mvmmspj5fduvcn9q/43059103018.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/07ef24d8a9de343482291206e7ab139e/75180089734.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/kunivetipovi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/85509077311.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8174b2d6dfe738db75f86c0b6e369d91/35570067906.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/8288461269.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/wufemiginumapogelesuwa.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/28217977054.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kowobezeniwil.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5e3c404145fb2defd5ed0de45fa7d1ed/repagegotitexixo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e245d774d---tapopiboz.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/7eafe38752c8a64b99c218d87babf957/nijam.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ef1d4f2206884b09c71432a62d238201/13309816595.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/lebuxe.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/fopafoledowoxiw.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/7284591046.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9af7d967---lilonuxareveputorotisawi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/karikozomijamudosonixuso.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1eb6a58a64b2e1839d9a7f937e520ebb/nivakiralujonesijirawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=match+made+in+heaven+meaningPDF 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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 10444 bytes
SHA-256: 55f664ffccd76485b861ed166e0b24982c2e170b8e8f2cef6f6ed7444324f383
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 20764 bytes
SHA-256: 5e6b43c8ad86cf5c4e5a1f661a0595f5d6800466f40fbf27d06c46e2d1623a4c
font_02_sfnt_off00014098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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