Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3c739532adfd1c…

MALICIOUS

PDF

113.1 KB Created: 2021-09-20 21:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2d627316d51a7f815f3271b39b97cc5 SHA-1: 732072c70953adc397ce037ce28a882c475c791a SHA-256: 8d3c739532adfd1cb6be30d6ed64c06382bc3cd65aa9d0a6d2bd7914596ecd58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=duplex+iptv+apk+mod PDF link annotation
    • http://balletpanov.com/uploads/files/ratesipek.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/13586639482.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/67230865197.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fimufageti.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3d4d7b1e---wikefegirowewili.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/biwiwulepisomuk.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/borapidokixalinejosewuki.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390503f3a55---48721380786.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/33769426585.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/84243971151.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ocvcukviifv0jlep3tvd9nk5j3/69001211993.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdc601da7---mowagapabidafunawi.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/90504741612.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/61058750837.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/bogoxedovetuwebutukefi.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/31176528303.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/mejog.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8b539df1ae827f94ade2a31d411cae78/11129430440.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/40327330042.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614302618825f---wikasazogef.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/ditapipefavilesepovorup.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/puwolubovog.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/30137949212.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/52520877744.pdfIn PDF document text
    • https://x-software.cz/data/file/jorepetidiw.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/44241647128.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_off00014797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14797 10544 bytes
SHA-256: cbcbfadfed968971949ed06b2da95e92b082ff8eb08f1509e13b26351b50b64b
font_01_sfnt_off00015fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177BE 23708 bytes
SHA-256: 8be821900574ecf5dbaff221a7427dc841c5716eba4c4a564ca801696a013b8d