Malicious PDF — malware analysis report

Static analysis result for SHA-256 7590cd947c2d8f83…

MALICIOUS

PDF

84.7 KB Created: 2021-07-19 02:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 703e8a4d51d076811aa17324c8fd359e SHA-1: bdb87ade1510ca2c9e04acf7e5d04e1c60f0a2d0 SHA-256: 7590cd947c2d8f833efb01d3f86378e0b0457574a0c4e0e6b676a0c9ae6c3cff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous URLs pointing to compromised or disposable hosting, forming a link farm. The primary purpose appears to be directing users to phishing or malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lso-msm.fr/userfiles/file/tukoranebusozasi.pdf In PDF document text
    • http://angelescare.com/userfiles/file/nuritagosudiwumujib.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608394c7b80fc---47695346499.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3p35nej2rd4q15bohncfrjcum1/matefonoliwiretexalafiwi.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/goxuzuguxa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pigesovafozelulijajibalo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/winojatuzomudile.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/16903924425.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/78541639141.pdfIn PDF document text
    • https://mavibusiness.it/file/dunogasogewojan.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bilixasuwofakasu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe76827d30---60714212643.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/48867773392.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21886188552.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3be30ba038c03df420803350542706b0/58123862139.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/26921293645.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/busaxaxinodesuze.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/kofise.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/49145976630.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/63921044004.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/955da880bcd2d8bdd07b645dde58b99f/burew.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/59876915745.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/3rbvj2ce0a7in08umpsn9jq790/65286464761.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/35739757070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+conciousPDF 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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 10360 bytes
SHA-256: 0f1f3c687dead89ae05cba81b6e06acef3d0c42bb3c1b62bf38534919e605aab
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 17288 bytes
SHA-256: 34cc5c7fbdefd8f9adce4bdc5c7b008160295e806d999e460dca2d6f291a9cc1