Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e7f821752bcd7d…

MALICIOUS

PDF

97.7 KB Created: 2021-08-07 04:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0466d57c6f4f8b0707fc77223593773a SHA-1: 123b565d3a7ea0202b2de13a5efca08bbbf2c946 SHA-256: 42e7f821752bcd7dc15ee3bc95fbeb6eb647702f56a6f5b6c156bc228466c51b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites and disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is part of a phishing or malware distribution campaign.

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://wastran.ru/uplcv?utm_term=axis+bank+interview+questions+and+answers+pdf PDF link annotation
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/92299697839.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/baxabemoxidimifaravuzip.pdfIn PDF document text
    • http://bwc.lt/i/zaxenozavikofuzu.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/2673542002.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a544c7d685336e71b9708a3f696dabcf/zesare.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-7/20210807032938105297.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/3279359091.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/losebaxifedo.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/13347714499.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/9fa47ku5spst5h1vjfas97q250/61059899370.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a627a564eb---84058457068.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/3473719207.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee60af0d10---dasuzoxidomono.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cd303537b24---livofitebenoduzifefuj.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/15141059465.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ik0g919ljt86pj64o7cr6psg7i/mubawob.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/73904680015.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa874a4aa---vejirokew.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/49370611221.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f399b90c9b---64058844202.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/93012130861.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/80033565187.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_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 17636 bytes
SHA-256: 8724ccb360c1efcb800f56cad37487dc8e520148340e3219e4b7518b754ed217
font_01_sfnt_off000145ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EC 11156 bytes
SHA-256: 53dca9ddab21dfb505847b821bb0be6b15e69d0fdbac78f2cd2d6aac53bdf776
font_02_sfnt_off00015fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1