Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70fc0d87a3b5da4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 16:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a376015c7c45bc20d61e8532422aeac5 SHA-1: 2e6b47cca496649c36ec9dd34508d3f1c408f243 SHA-256: a70fc0d87a3b5da4d8f2de494c255217592ad530613c16badb8a21070b9e48cf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and heuristics for compromised CMS uploads and link farms strongly suggest a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4400

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://bielle-srl.com/userfiles/files/lafuwizimikiduk.pdf In PDF document text
    • http://gsxr.hu/userfiles/file/xobuxuvitoguzupuxagedika.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071600429a3d---zejotejamisawosogope.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109051238187283.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/bafotuxogutud.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8q3mm96355bc44k3gluq8gpaaj/joras.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5cca4577---mipasojoxusikomawilube.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/4021701586.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/3007441826.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160826e9c2b788---lobebixurunin.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/10709522004.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109062229179980.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/gegasokosepawivimi.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/50514511406.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/12084081559.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c8357acb1---1074698813.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/titosesifanafabuzo.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/nusijoxidi.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/44359842367.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a972ca83f7bb4ae77957ddc026a13ed4/finidepoguwomofiz.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/76729607779.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdebcc7a0---jegikovakewu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/27hkoqbdbkeq4thakhnj8152d3/zoluweritupute.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27e6696090---wakifimolekiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=12+times+table+worksheet+free+printablePDF link annotation
    • 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_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 11016 bytes
SHA-256: 577a7c93e3f7d77bf8fe03bb27a9533135a1eea8a3ddda8964ab9e2e12158958
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 16064 bytes
SHA-256: 43cd422d46299e32747c6462d74588a911ac08c99e47175fe597d3fb28c04203