Malicious PDF — malware analysis report

Static analysis result for SHA-256 7857afb25400f11f…

MALICIOUS

PDF

112.9 KB Created: 2021-09-10 19:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cff577e805179202f86fce83e4903d0 SHA-1: ab5a445f7c49a28b161a34bca51b1d3a354fe056 SHA-256: 7857afb25400f11f0ccd69cca664624258a5cfcbd93d4d78d41a3d7b7bc3765d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to potentially compromised or malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bonvoyageindia.in/ckfinder/userfiles/files/kasubiwonutekijibup.pdf In PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/57260471976.pdfIn PDF document text
    • https://kaimano.it/file/zexulasozawadino.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/fabavofum.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/roranebexuzejuwomokek.pdfIn PDF document text
    • https://izr.fr/files/63135817311.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2b479c66---zudoxak.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0553560001631278899.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/89947004164.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/47947202188.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/72494191071.pdfIn PDF document text
    • https://shibbirs.com/media/files/xuwezaselipibezodoxuzugu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd8479dea---dufozadunimazu.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/54567275007.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613612c389393---givetod.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/4037065179.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/zalosurajasolumepemafu.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/72979262189.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pilularewunajinubisegow.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/wodurepaxalava.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/80700006314.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/liwonukijefekasolanipimej.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/29959789580.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/wikanajaregamurapufuvuke.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/27492495756.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/najovafoxex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+s7+romPDF 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_off000157b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B2 18132 bytes
SHA-256: c9ec6340418a09b217f2bb1061005246d4ac64ac635c42f1b73fbf499ca8ac94
font_01_sfnt_off000186b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECB 10308 bytes
SHA-256: 3229bb5f9380639b80e085fcc1e57da087d319cde46f2948d078ae5dc76a1c4f

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