Malicious PDF — malware analysis report

Static analysis result for SHA-256 568157154a0b91b3…

MALICIOUS

PDF

87.6 KB Created: 2021-08-15 07:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 392ce4b8539294af40f76710dc75f27b SHA-1: 66cf645d8fa9343f51380e4a38de1a9fc6249066 SHA-256: 568157154a0b91b3759e2f51af41f752931054fc4e95f8aa1979c28dd6f2da60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a visual download button lure reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c808b7784f14dc4fa5d73ea179e70bda/37658845826.pdf In PDF document text
    • https://przyklejki.pl/userfiles/lazipeximag.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/mususagonawugixif.pdfIn PDF document text
    • http://screen.by/images/file/bimupojite.pdfIn PDF document text
    • http://oroszvilag.hu/userfiles/file/vogalukemogemomo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ed7013b62---79983762175.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a22ba3ce9bc8f7e7788f1b2656520a79/46215740714.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51762429604.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/kaxodomajigemaxexutela.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/85044559300.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67eb59c2a---bapelonosebiforizuvaga.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0b02bbe82d1f94d2f81f774ddab2998b/1232971141.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98758dbac---6986854459.pdfIn PDF document text
    • https://htchninc.com/d/files/kisejonoxawan.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/97430647090.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/78731972864.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/86441264996.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/290db96397a3cd4759b90f37f8604ed5/fagoxo.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/posezojekonotot.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/zogavekowibawadujizizuxul.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0361d3351---zapabo.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/97108304346.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/fotoweva.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/gefokofovosokidiki.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/48255838830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=american+pie+reunion+movie+download+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 18208 bytes
SHA-256: e7bab233939eb1b854ab8fc1c5c6fad2cbce00875e733fe01412e4dfc5f31fa6
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 10740 bytes
SHA-256: 637fd5315d06f21425be6b672f90e60a0165e94ce3a82a0e8f457566aab21c91
font_03_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1