Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2b80f0f760a84f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 10:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8befec45e96d85546a6d2dfab942134 SHA-1: 4935f3c25ab9a7b6a387b05a3402fce626d0fdfc SHA-256: bc2b80f0f760a84f9b1918064b1b6d8812f470bf222e9092e4eeaeda294adc3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, with several heuristics indicating a link farm pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://butchercurnow.com/img/shop/contents/bopuwagiwatasura.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cq13rl7da4l61rb4csimegbpg2/26362696691.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/45377176407.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pokakazorija.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/76521043057.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/59088498563.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/feterixivukixegon.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/sagadopiwozusix.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/rilakeselorupasaxamu.pdfIn PDF document text
    • https://solturism.ro/images/file/rixoxuxelorozulamix.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/roxatimupivurugedeponizav.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/23198013833.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b030537fe87966c27efb3e40e4a289d1/batokepalurazale.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e5074ea1c---dewegasitupilutomozogejum.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/78875616858.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8459723b8---64149286554.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/90887484397.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/foduwuvali.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/venivubatazenixekiruv.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/bitigexopibi.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/7278420617.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/33336428076.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/83908890029.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gapezadozevox.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/65729866514.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210904172301_749142962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=just+married+hollywood+full+movie+onlinePDF 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_off0000bc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0C 17412 bytes
SHA-256: 3852dc26ba927e404b24d781e13dabfd353c0a93f37697a209c29b6c52feb8cd
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 10976 bytes
SHA-256: a1b9320df23b8590264f44926814ba08eff90ff24fe5712c3f9b1504bc9c0306

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