Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5960c1627eba117…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 18:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f31ba70b87fcc9b212fa0ec30aed79e5 SHA-1: 772771a19b38c41abd637f039e67baa5831d57c3 SHA-256: a5960c1627eba117f5567377ec2889a653051a81e55472307fd00568db506754
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, including a PDF link farm hosted on disposable domains and compromised CMS upload storage. These elements suggest the PDF is designed to redirect users to malicious sites or facilitate the download of further malware, aligning with phishing and malicious code execution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://regmac.net/userfiles/files/4569038268.pdf In PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/sewovitidamobezedaje.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/94208664448.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/24704567213.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/90876129464.pdfIn PDF document text
    • https://thepainter.asia/upload/files/dodidugakadi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/o4qdpe8pk01651472ps47acdv6/82402668601.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/mibagibakasaj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gupixewedexukebizu.pdfIn PDF document text
    • https://priscar.com/documents/files/gamekopelaxavuvokivi.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/wamagasadamariru.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16146672f03806---kobego.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/galenerofogu.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/bopepufusabufezoxelonakez.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/ziduvinenude.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fabuxikixozok.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/zizovoru.pdfIn PDF document text
    • http://mobitransjogja.com/files/jisagaselamafasozerise.pdfIn PDF document text
    • https://www.confirmedtour.com/files/97779011931.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/mipet.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614989b22854c---nifaputuvikomowul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+v+litePDF link annotation
    • https://lapdonline.org/file/dudulatorazamavuwojef.pdfIn PDF document text
    • 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_off0000bc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC11 9712 bytes
SHA-256: bf3a12e5981e28833164273a8aeb89ba0145ed970ebe2336e7c78420d28f897b
font_01_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 19468 bytes
SHA-256: 2700d73f6a0bcba1dbd0b80aaf0b4bf760d03968906b0535549de2664ccacbfa
font_02_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1