Malicious PDF — malware analysis report

Static analysis result for SHA-256 eade05d94d48a05b…

MALICIOUS

PDF

126.4 KB Created: 2021-09-19 14:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 82bcb818d131a555f95ad3f2ed79ac1a SHA-1: ab537ea8abda005d07c616e6af8dd5ecbf2347f8 SHA-256: eade05d94d48a05b9dce61f4f416202533031120145f648e16a30407a6234f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://catamma.ru/uplcv?utm_term=keyboard+fonts+apk PDF link annotation
    • http://1yunnan.com/ckfinder/userfiles/files/39590660561.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/lawekulijenapavel.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/62487260329.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab534c9cb---rexeguzesedegixovitun.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210917184854488233.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109160914352351.pdfIn PDF document text
    • http://thegioioto.store/upload/files/paxaginofi.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/35211597476.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2c57765dc2a021c46cd66cc6cd12ddc6/75773741581.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/58188786388.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210903180346570197038.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/82714511725.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/90728027152.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/ravuvezotiwelo.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/10761902088.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/96281032592.pdfIn PDF document text
    • http://bulmarconsult.com/files/bobeweza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab692df4c---57656412269.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/61661337487.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/kegevejetuzolobipeze.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/chm19hat7g2jsrtbln1cunv388/29981524628.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108311720143935.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/fuxirefuzivol.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/walivonitiduvusorazu.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_off00017ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE1 25152 bytes
SHA-256: 6185c43e7cb7cd5c478889190e892f5722353b5135d419493cb681dab1145da0
font_01_sfnt_off0001bb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB99 10692 bytes
SHA-256: 5b4d9a2c29fe7f3f4e03493a280419d2c2071a7c31aef0db69b4795c4467e97f
font_02_sfnt_off0001d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1