Malicious PDF — malware analysis report

Static analysis result for SHA-256 6911efcae903ad2d…

MALICIOUS

PDF

94.7 KB Created: 2021-09-05 12:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81e7fb27abc16b32456acd69a7ba86a4 SHA-1: 9ee0b69619f71b63128684091e2468b10ba53baf SHA-256: 6911efcae903ad2d1328dd4539828ac487cf62c26d7583aef1e4537fef3a8e86
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/886d592052350135ddf6be0a336f9f8b/29129667024.pdf In PDF document text
    • http://savvyais.com/userfiles/file/bupizepiwekosafarixeza.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/u24i8t4iq0s49glvtpufitfj35/tuxirapom.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/laduwatitedaxavamolub.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/17356733858.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0c0c0c81243efb401ea60b40911ccb9e/44457125873.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/liregefafitip.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/rutinudizujuzekixezibip.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cdb9cb1f5---38908974580.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xumifufujaxixuloz.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lunil.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/xaresiwute.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/resabibapirofax.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/16dvmq7si63hulccm8v97oakfe/9948919544.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/47943017093.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/salajotifipufigolepojin.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028e74b875---44374940728.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/15810246483.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/polopisalodu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25b34d55f---fanunetiziwidogisogoxetix.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/10a50d09b50d31b410265ce5331a970d/xuzenasonebefijebivokesot.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/gitedebolusupovufegomu.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/56348639921.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/42a1587e8b104a49eaabcd96dba3b678/76450787452.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/ziwazineguxudunixeputuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=insurance+policyholder+taxation+manualPDF 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_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 18696 bytes
SHA-256: 321d931284e5a2fe8b859461371733f6c0766292b3e860194f7c693b9b909a9d
font_01_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 11048 bytes
SHA-256: 7a0cac9475bf076ee25bafddf46f8aaa059401446f95c4322534ca469c28c379
font_02_sfnt_off0001547f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1