Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a85f62df061fdf…

MALICIOUS

PDF

72.3 KB Created: 2021-08-17 13:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8320eb2488da97ae3d637263aa02b56 SHA-1: 23ee8322d6fe29b2f48d265f3f32cbcb5dcf8fc0 SHA-256: 20a85f62df061fdfc809bb20337a110a3605f825766b781af64cfbf5ffd7fe0d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to distribute further malware or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=relative+pronouns+who+whom+whose+worksheet+pdf PDF link annotation
    • https://takarasushimn.com/userfiles/files/siverusazava.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8399675c4---73840779386.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/lt4222hlcq5gp3lahvocqpqd74/meveda.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/61310963920.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22451cfd8---64878266632.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/98165193653.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/92504043487.pdfIn PDF document text
    • https://arerp.kr/data/file///11789973472.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06feb0675c---77907077218.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/26677700735.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kasogixokoguredodijer.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/vakatanekewamejofenosonug.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b68b13702c9a05176b89f63e61100a6d/dijegoweredin.pdfIn PDF document text
    • https://roc.mn/uploads/files/36980999222.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/5202322079.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/pamunojatesobapoti.pdfIn PDF document text
    • https://wecareprogram.org/images/file/33243073218.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/vepojivixiwuraxo.pdfIn PDF document text
    • https://pecsikult.hu/files/file/mepiri.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c68cbfb99---pifipaxasinenif.pdfIn PDF document text
    • https://birudongker.com/contents//files/43199555643.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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 15876 bytes
SHA-256: c9dd54265a408fd4a1145c63c3269810d91e41e9d3ac4f4366540e2227ab8d3f
font_02_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 11152 bytes
SHA-256: b7fd6426ae710e515bf9cbd15830386ed525f85ed92cd66fb2c1a7468925adad