Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ecc8d06726f1c0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 23:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f0257ffbefa817fd1ed990bf34817f6 SHA-1: 0d6a3e0a8cbf12651960bd1ddca8b12c4353e2a2 SHA-256: 40ecc8d06726f1c0a29a31b69f67d715964ba67c6ff98d6ba817167e9b4cbf35
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

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 http://copy2d.com/ftp/image/file/49433517355.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161168db2da70d---lodututilugozevefifum.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/zarelubu.pdfIn PDF document text
    • https://ksboutlet.com/file/files/zedipukuvakebifi.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/8318628082.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/nilokosik.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fdl3ohajos39tp33g339rpv1t8/78625041743.pdfIn PDF document text
    • http://jaatkinson.com/userimages/64488107399.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/zuwujumukomiragod.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dddb2fae0---48969479566.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/rerepebulitilagobuf.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/dipuvovug.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xeluwuf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d741003d3---10049925715.pdfIn PDF document text
    • https://ovalpolycoats.com/media/zosilorofumomuvowajezu.pdfIn PDF document text
    • https://impresa-valli.it/file/gozomadafarigafoweka.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c00721deee9---tiwarabimuxo.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/sugijigewuxupod.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/297c277da48105b0e5c53380b614c78f/92550424234.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/moxawuwof.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c801a89a32f8aa9c6052fc623ec85703/vipikaduvom.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/xavoxafopadamobo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c10c748266---90033225914.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/64842333697.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/47663556973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=maharashtra+state+board+11+geography+book+pdfPDF 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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10928 bytes
SHA-256: 4ec1b2f1801b11ca43c9f87f6dd67dc83da90380314cf9b3b463fa25640a2bae
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 17000 bytes
SHA-256: 99d1827a834d1cb84234980991b9a8dcdbf3b6fe5e5a96f69c375b23bce07a8c
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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