Malicious PDF — malware analysis report

Static analysis result for SHA-256 662443a36f541715…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 12:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 65dada58095ce92e78bcb5aa97b38be3 SHA-1: 75133311cabcfcedd36467db508f035bdba8c218 SHA-256: 662443a36f541715d3291fc18504f6902778dad3a5d719619e76ae13b6daf9d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff70a3257e---rezejuvoj.pdf In PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/14889163272.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/loxetati.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d245206af3---lopizujonelaj.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/fatutavoxusizesawoki.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac39debe5---76864735667.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082400c9287c---11992559810.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210524213800.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xekuloz.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/munigebofexujelalaruvetag.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/bikegazuragoxadupep.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/30937956885.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a662e8e44e---zufetaguxaju.pdfIn PDF document text
    • http://promador.pl/userfiles/file/sakigofim.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/e1iib06f805ek7d570hfs0lmjo/51534776186.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a09f13f49---12372062153.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/jederetugago.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad2611db82---mupegosiveseluxajobabuxo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d0aae54ed23df4b5964b131a6447cf51/turipiwudakuzogokadeba.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0721c667c85ab7c978db9ae69b8c0574/14385304274.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/50334700478.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/eaa7a4cea3c8e69952ef619e31621d69/kujotegonafafofa.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/xavubadotiliganutonuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+connect+headphones+to+chromecastPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 17068 bytes
SHA-256: 03add53e072695e7ab39608adc309e112b38fc3c7af82fbeb16acd30aa991d2e
font_01_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 10720 bytes
SHA-256: c75834447f6f481edda823e004341a2ea902217488f82cf85463daf1a5ce15fd

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