Malicious PDF — malware analysis report

Static analysis result for SHA-256 450d34b82d4a09f9…

MALICIOUS

PDF

85.0 KB Created: 2021-08-20 19:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67744a68bf0833f3517cef9b809089e8 SHA-1: 877bf12d4c16dea6237c729cea6e0d9377e76871 SHA-256: 450d34b82d4a09f9070f7b49df2c4c70ae29f346496cfb1f97ee1ad27e2d23ce
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering. The numerous embedded URLs pointing to various domains, many hosted on compromised WordPress sites, suggest an attempt to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://crewmak.ru/uplcv?utm_term=cuando+se+considera+fiebre+en+fahrenheit PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bc7kq9esnvatebme75gev15ar2/sapatamo.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/maxerijinoreten.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/3056764224.pdfIn PDF document text
    • https://aghs.in/ckfinder/userfiles/files/vubixubexizumigefow.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca78d626e3---54331369884.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c0bcfd4206d863eae52f2f87c5e022ec/semixurulizevusavi.pdfIn PDF document text
    • https://educhina.mn/editor/files/23253253163.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502131542337419.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/lijotejofirit.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/34553216727.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/57012635300.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210802220541.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/27768938836.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/64903189104.pdfIn PDF document text
    • https://sinarwaja.com/account/files/pafarapirep.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/wusiropamaveperoxejisemet.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/xagasuvugitelivekubi.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/17078870281.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/95516301958.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1pcg1s4qvbs09pm764vsn7beq3/57275189930.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607008b938cc4---ruvuwir.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/140a4976e402b9c701b3f4f65f62e355/begiwasapiruvepotutaze.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608af8dab4af9---87976638829.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/gifobaduxexaxazog.pdfIn PDF document text
    • 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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 10796 bytes
SHA-256: e759e48a20a18ddde5eff1fe6b6f54e5b604ac10c7da1a7242efad91ed4ff034
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 18704 bytes
SHA-256: 3805e5d25a8bf9adb05c241b43a9817ca504a76d2a7ed687f2edcc13ed8272a2

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