Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fefea812b72ae27…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 12:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa26e5c1936db5138acb72a724d5e2a0 SHA-1: 00f3e538a1bb29a49c752f2f27ddfc8e85e5c620 SHA-256: 4fefea812b72ae27844680a2e65ab046fca0ef3d338ad8c83eaac0992f92a764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URIs pointing to various websites, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=how+many+ounces+is+1+dry+pint PDF link annotation
    • http://clainvest.pl/userfiles/file/jepeliwiz.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/82717946664.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/22108dd7c58657ea6d7e8b5adb78a8dd/79238751960.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/67858258478.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160e00eb8621a5---zisibamojuze.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/peritojipitetesiverogo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/89089968910.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/pizenuwifafenabeletarota.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0136c79bbb---mitobafizamilapezorodis.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/89f4570318bcee4498f6c7106930896a/ledojegikovavevixenare.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8949331d5c---zatinuvexumamerinixuk.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vubegixudojisi.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1628477267_60578190a9.pdfIn PDF document text
    • http://ebus.cn/up_file/file/gixusarejadesu.pdfIn PDF document text
    • http://demkapi.com/resimler/files/946662667.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cc91f7c94787a7303f189ab64cc1c683/98552553943.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/pezevow.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e1bcb30f---41722103368.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/lokasedegakubiri.pdfIn PDF document text
    • https://siroyensao.com/upload/files/rusofezonovusotu.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210808_0D069BE41115E277.pdfIn PDF document text
    • https://servicepapik.ro/files/dupunodoke.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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 17668 bytes
SHA-256: 560cfae4208c3f85e13887195935b31ae3c393914f368a0d2ad3d2f5ad391189
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 10972 bytes
SHA-256: 2e69bcaa1f1f6476e0cd714e18b4932e8742daa646264752e658c23da8ed1df0
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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