Malicious PDF — malware analysis report

Static analysis result for SHA-256 271613835d2b8794…

MALICIOUS

PDF

115.0 KB Created: 2021-09-08 06:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b563603e4a72039449e504e241355e36 SHA-1: 2e102d1a45e89224e916967c8d33e7afb87e1c64 SHA-256: 271613835d2b8794da2445b7cac4a3a7abce4b6a03662bee402b3b0642e7c3bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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 http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c633e91f27---wafuzixada.pdf In PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/filefav.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/092b9fe2fa8149d2af873735098f6b41/jalavosejefimumijururi.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e05b638b---3118817194.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8267eac45e---disakexilukoboti.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e5dc7e4f70ee514af6b53de6839079b1/82402382341.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/padigovazizezov.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/40279777516.pdfIn PDF document text
    • https://sanidom.pl/img/file/65206250491.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/13603061898.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/91b6a126b5c5b7027c5dfdee990aa84e/51816535469.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/88250758973.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/tunemoropuguba.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074646601123---wijolun.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16110f0bf7c907---daloxekawaniwekope.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/wigufumegimu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ca3b7b75---jumoxidiput.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/niredolafufikonafivuv.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/43261253137.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/runomupamipowaruniru.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gibesivuzajed.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/rakatopirajodew.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160744af5759e4---fefelovit.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sb63kap37902nmj4smlq9iho0t/litovavirek.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b76b1a00---2198453764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=docente+mas+manual+del+portafolioPDF 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_off00015b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B09 18876 bytes
SHA-256: ca72342538c50bc7e04433c99cf964aebfc8b4b7d6ee33ab244016d1b558d41d
font_01_sfnt_off00018b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B48 10884 bytes
SHA-256: e8ab84c4c6addcb1b2f93a6388fdb2b4d6e7c4bb9bf906276b356cf023fe1fbb
font_02_sfnt_off0001a45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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