Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb1a84db3897e75…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 15:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15ff9f175561f8e1aad662bd2ff97940 SHA-1: 79dacf5c53ca64d7b453e68d73c4d0ea851506c5 SHA-256: 3bb1a84db3897e7566f5b651063151d63a3cab061e69504a16f16a8efaaa6ae3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://wastran.ru/uplcv?utm_term=online+tv+all+channels+app+for+android PDF link annotation
    • http://wcsps.com.tw/ckfinder/userfiles/files/rafebogevorodufumakawaba.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/bozikar.pdfIn PDF document text
    • http://alvitraders.com/files/4476538221.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/gojezufuderut.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/90171662696.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/15499697211.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76234726653.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141143e020c4---judaroxad.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/92839151141.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/kitumokitowudawowixupe.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/bokevosuvokifaseno.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/60989761139.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/92375048118.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/39373933318.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/sinufuxizujonivajesekab.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kv2fivghbhsf7n6egm0atmua72/94365662911.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/7575740519.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/lifawemafewisapa.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kosiligamini.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161403af663b04---87599544144.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/78446762278.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903080506.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/43630610448.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_off0000c005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC005 16436 bytes
SHA-256: a62414435e7e3247e0474a45b0e47dd682858b99bf8ffd173d2c0cc57fd7b53a
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 10808 bytes
SHA-256: 91f0175fe75b44c5367d602c697e2f792a1335649975b0771af9fa04c9dcaec5

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