Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0acb213fea37bbb…

MALICIOUS

PDF

74.3 KB Created: 2021-10-08 12:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5de03e8fe62c7263faabb7397b94093f SHA-1: 46ae2a044890d9f7a7c0e9409a7cc075dc2bd65f SHA-256: d0acb213fea37bbb6f69a8a87f308ad018c30210682d890afeac0d887e66e205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the document as a link farm pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=l484+pill+norco PDF link annotation
    • https://jagamimpi.net/contents/files/pepuwelusadili.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5elfueuf2h7cvrh4jb4jnol846/rudupawomar.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/42941152376.pdfIn PDF document text
    • http://llux.vn/uploads/files/jadekasojudunobewawovo.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/87864681034.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/4712017345.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460c8e93c15---71469751724.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/61263201176.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9f2dd7d4---97727227548.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/bunusolane.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/zijozi.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/folibuvadozobaxujuf.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/moxedagiv.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/zulijigeze.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/pefudusuvodaxitesipin.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/96093355473.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/93591862074.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/dowunokakuseli.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/xonewidefokitixeb.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/29236408847.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/15359986116.pdfIn PDF document text
    • http://thegioioto.store/upload/files/69371876572.pdfIn PDF document text
    • https://wrd13.com/force/file/gorasozisugoxujene.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/febekunokigox.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/41973215067.pdfIn PDF document text
    • http://peoplefineart.com/assets/202110/files/20211002151020133677.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_off0000be29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE29 18388 bytes
SHA-256: bbd2b20c5c8b7317f24ab001f77adb5bd7b2c5957e51c8d47f08eb837b76616c
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10052 bytes
SHA-256: 1e9c8991a35a7708aa22b68334eb97703938ccb3804c1d0f8bec09bb794ce41f