Malicious PDF — malware analysis report

Static analysis result for SHA-256 b768f7f6c5847296…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 02:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb4bad69bfaa8433d47760e41b025b46 SHA-1: f904d533e07fdfa8aa4534f3b649bab15c25a749 SHA-256: b768f7f6c584729649088d29336620e1c12b9412355f12144c79d034585004b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6480b44871ab5b43e9e6edf1d1cb58bc/29526749991.pdf In PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/rikanubenugodonore.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f71fb2926961845a50abf2f7bc4dc493/8180846146.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/wefusujemorenipuloxifakel.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/majokanare.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/siwex.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/57658057ef171815a52942d5b92c59e2/munejugasilorevezapuw.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/86118598578.pdfIn PDF document text
    • http://dgkno.cn/upload/tukolofiramijokemoku.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113350d02a72---78501604269.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5817ac37b5---gomegegedawapezisokew.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/putagizejufatapom.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/segewed.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6de91fd307a59f37a76756aaebfdd520/19728695405.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/mipiwujipanededafekanese.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f20cddf2---27472892488.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/51038647423.pdfIn PDF document text
    • http://huiking.cn/uploads/file/192034056359.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0890de5e8---jijowozenalalularetedi.pdfIn PDF document text
    • http://netflor.pl/upload/File/mulopuxut.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/84085319732.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/28957374711.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079083ba9371---91553405089.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b888a0db76d---rojurulopumugitenudena.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/4151863810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=twelfth+night+character+worksheetPDF 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_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 10756 bytes
SHA-256: 4395df230975387366af50946accc366fdc92767d67e485d46f1b5d3bcf7c4e1
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 19136 bytes
SHA-256: f988a85ef58cf68aa6207a0f77c3fe30784827dc85d5dcf04f3a7dabff7e1eb5

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