Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1144e49700a04f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 13:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77484269b8734393a39f0873819df0b9 SHA-1: 4abfcd5881f5b9122da49f6036cf4a2d74f67a58 SHA-256: 5c1144e49700a04f3bf30389311cedbb4cb32639c5d4be43d7145e99a9f5dfb7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237cc0bace6---vosibojumamak.pdf In PDF document text
    • http://go-pxl.com/uploads/files/vavoj.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/87952947644.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/kozigorekaki.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/37452711503.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/femisetelosuzamo.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/80794758771.pdfIn PDF document text
    • https://basisnomor.com/contents/files/73873861837.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/pubododi.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/viragepoxenabogaxomavim.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/zobabufijupatudeg.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kamada.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/dozinajuni.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cad1896d8---91869909040.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210517004833.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ce387423c24---lokibafebunopowodido.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/aku4lrqjjqf0n8ekabafdffb73/zaxanoduvifub.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/14465778582.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/difatiselak.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2dqa1ibsspjeqfcbi4eva0rll5/kebegikosol.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d344d2f40e4---89835098687.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qihiagqh0jrr2vlei8f77sl983/26194727019.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fff8a74d2---pobudagidikusaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mens+vest+sewing+pattern+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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 10652 bytes
SHA-256: 9a0c50eb8faea8a181438051fbd15709cd17916a75c1622bb37ddd340bd6e003
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 17064 bytes
SHA-256: dee2b473e9fb8a7de7c4413761b0a1c42e4684d61a2666642fbaf5289aab3af9
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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