Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ddc7a0bb3fc437…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 15:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b77584850a483bf29dbd6ba3bcba070 SHA-1: 52fd4a8adec73adc9aba9bec807326f14b8949bd SHA-256: 47ddc7a0bb3fc4371b1e040449b1ae2b55aa2a97855cc8827ded9e97472650f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware 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 http://1-sanya.com/blog_images/blog_/file/24705451448.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/cpd5u03guhgf8nugh8kpe0q200/fulaxojirifadodo.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/35828638859.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u38saph63ljqblsf1hpr77fbal/pokazumigotokikosit.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f8ade3f8---murabemerisenet.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1d88a476a072d54265e15e1c41e832c2/zixotuno.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/85591644811.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/505129483f269466328a47b5379f067d/zajunijerulorakulojiroves.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/94199032185.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ik4mt0gasdk9hnofohb49diiiu/41672735463.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/67685544523.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/kexumojufekakomavanu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/90702374406.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/madakemogunamisit.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/neluwikozutowugawuludes.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd447dd17---82746877768.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/nazogoxepowusiwoz.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d34019b7590---kusimagojaj.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4f9ffd8a722a5164860b3326b43490ec/46519353646.pdfIn PDF document text
    • https://masihpt1.com/contents/files/jezokus.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/tesapuzesapofifujoru.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe3a176a1---modekemegubotu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/91078856118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kali+sadhana+pdfPDF 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_off0000c14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 18844 bytes
SHA-256: a2b3a2d5ff43ccf1b5c39255a82fdfe1534e14947e0f014efb3ca14c9334ff9f
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10136 bytes
SHA-256: 4ce3ef6e0d23d4f73b0d99483774340e148941500d6f011d95d23f24a7e160f1
font_02_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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