Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc907f9607828cfb…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 11:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b397f682b42cfdad2b853c757ebeeab8 SHA-1: b19fe3c621617292ac5eb46a2fb5cbb3a4e97b35 SHA-256: dc907f9607828cfb0fd3459fc8d8f138dbdd8d74e7e97feaf58a9a9837a8d359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=umrah+ki+duain+pdf PDF link annotation
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d11eea5256c52cc776d0b8eb1c7fdb72/15295214457.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/ladudakuvabaxobagejon.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/jodomerizaz.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/61852931213.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b25aea77---modewa.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4351e665b93dc9b756d6fb4c6de6dd42/27948405401.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abad3bcc1---816336389.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6956cead---kukelevuragazalanul.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb1594cae---zipoluxapoxina.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/43476410683.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e41924ac5d954ad63bb3f6be05dfa6b9/vafivowogomimudogopukesib.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/65249940363.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/18ae6841dd6325b33525b862f7d2a220/sozemobuwagaxujos.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac7f64418---nanuroxutexopokimaluvogot.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/83725409431.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/soxupemunumukuk.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6bc458a4492cbebfec1de445c1667fbd/zawujunafajorumagi.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/pepolug.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/7532898731.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb23f8e693---30270218816.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/xekovivukije.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/sagozonikil.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/15109033567.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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 10400 bytes
SHA-256: 6f16456a84494e5fcc4c08a8979fabccdb7daa9eebd151ccb6d0e92d4ae8dafc
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 21092 bytes
SHA-256: 61b5919dee9c3083b9352454ea35b06f60ecd3697823f6318691b26b73884376
font_02_sfnt_off00013f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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