Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfc3451d9e3314d…

MALICIOUS

PDF

95.8 KB Created: 2021-07-03 20:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fea97cef3cace99f44f32e094e78be42 SHA-1: 986ba3b905712adf1b3793ef5c0b7785cea26d75 SHA-256: 4dfc3451d9e3314dad056fb0dec4e97a47d0fecf6b1e6b056d314bf558057d14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://chandrakantmusicacademy.org/ckfinder/userfiles/files/65850007684.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/75863022647.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d758600b3becbb7c8804509440d3bffb/gisas.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ccdbeea0---15313239340.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/punibixapegubogog.pdfIn PDF document text
    • http://groupkaishan.com/d/files/69471606654.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/s8s8cf0u78pef10sqdv9sjvb17/97196744060.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6f9910b4---boruj.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/37776070496.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4225f660202e3fcfb6022aad68af1651/40269955197.pdfIn PDF document text
    • https://scriptdd.com/_file/file/78656560206.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb69afd00---puwadoviju.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/92924347005.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/sumitajujidukego.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908607f2b11---17255739414.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/22363991784.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/648f9b9ac5b36b5d78108ade7cd459b0/ratekubikulifarupunoxuj.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/70589342390.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7cku054mv2gg164e5lppi7i64c/mopalexixatu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f702362df347b82e258fced123f20452/gamarajepebojezesigusi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8d9120d8911507c5677565c3779a5fa5/posevegisozowoduviteri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=south+african+population+by+racePDF 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_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 17656 bytes
SHA-256: 9f88baa79ccd959de30bfc251bb3a73b0b70f8acc181494b7054b697b4db20ec
font_01_sfnt_off00014151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15968 10840 bytes
SHA-256: 798d5ebf5fd8b36d75d7566fdc1b911211ac0513bd5ed5a151dfce90cc88ea49

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