Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81482fecd44acb7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 16:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3d7bf0582ef1a3f2e9a56d24f1bfbb8 SHA-1: 95b4e8beca906b1f88e4458c0a6b6318187a8118 SHA-256: b81482fecd44acb70b8e229c4af897d665de82ff66a23cc7d20d5438aa612266
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://clifestyle.net/uploades/userfiles/file/86661590642.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vbrnmb3are3psvh4l642pp3476/1858947384.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5btas8d9c2pc94cqsu20isukir/bevaxiruvifazadib.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607115e4438d7---noligarojovikig.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210730_194846.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/65813128428.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160811e0e46991---38012011108.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/lenima.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/nadijakiwifaxedi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/34512438200.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/90b94f49d9d3b996a9db8ad00e95c3ad/74357542219.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ec784ce5bda9cd1adb6b615590de6626/mifajabufugujegemitav.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/11377453329.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/telerijusumo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e21251c9d---16548596445.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108310306305671.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79a1acc8---lofozofimebadonebufoxe.pdfIn PDF document text
    • http://northcity.rs/slike/files/nagurekomobupijuve.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/1947789776.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/kumagelidosevif.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/padezilusifalorulegaruzob.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/taropejawafatomobiwigogan.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ede79dc47---45679144128.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/063aa524971e49ae8bb6e9780e3ecd40/31010512215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rapidex+self+letter+drafting+course+ebook+free+downloadPDF 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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 11360 bytes
SHA-256: 7c2e4d26d9a010c668fb97d97d19a343817217840297bea571284c6e2528d45b
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 19196 bytes
SHA-256: 677b1938f657d13cba5c9528ca2636399776c2062d41fe345b44564a3a9d27af
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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