Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d469794e8ebbc4d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-26 06:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a19063b43746e9b138ba318166f12e20 SHA-1: 5858c5ff471bc6dcfe77fac828a41890eac639ad SHA-256: 7d469794e8ebbc4d3290764b1a4c5e02daf7533771cfc8a09edda6e5b4fadf2e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple URLs hosted on compromised websites and potentially disposable domains. The embedded URLs are designed to obscure the final malicious destination, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://realfootball.gr/userfiles/file/39670848595.pdf In PDF document text
    • https://betentour.com/sites/default/files/file/42094568520.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16144b92d5f86b---nuvanazetadawukuzaletolu.pdfIn PDF document text
    • https://basisangka.com/contents/files/73387743331.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/85286549623.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3dcb3947d---tanixopos.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/xafagepig.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/renaza.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/xomunoninozivofewakaze.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/30460798971.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/34854584957.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b1084855bc2b7c3e1f3f82815279e4/17391249254.pdfIn PDF document text
    • http://runo34.ru/attachments/file/pigebe.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/10246619818.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/69102141416.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/91562768389.pdfIn PDF document text
    • http://artospace.com/pics/file/boful.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/16506409419.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/93340576137.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/56308406981.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210922212737.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/xumudanobaduwozu.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/97190956831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=god+talks+with+arjuna+pdf+downloadPDF 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_off0000bdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD9 17728 bytes
SHA-256: 2e37006efbb0cd47565fe461495986b4ec46d2a9fb9428bd49d059a4c1afe898
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 10908 bytes
SHA-256: e9b4c9e4e69335fef6ddbc42b3be7d536756baa4d78a35cf05d46171f130f9cf
font_02_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1