Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a6e21d8f3ffef4…

MALICIOUS

PDF

84.3 KB Created: 2021-08-19 15:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1c01a911f85492dbfca47eddf805ad9 SHA-1: 072462e8bab884773584cb167324226449092442 SHA-256: d7a6e21d8f3ffef437718d5160a98048c699fff5ff329aa84b79fa6cb949c961
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute further payloads. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is intended to trick users into clicking these links, likely by impersonating a payment or contract document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://lovesushiscv.com/uploads/files/63680393613.pdf In PDF document text
    • https://vmwarts.com/ecovic/file/zigutivikitabuviziguvur.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/71360269400.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/24560992913.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd03ca6c18---jamelowakagenu.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/lemegikadezepamodog.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/79102991241.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106171748364741.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/piwexepuvuvu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/11725608708.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210817051240_2004404019.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/73eb101984ae834028219e9d7ccd8015/95380190030.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5d46913c---87671370723.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/joropuwuzuwoxazegisa.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xiberazaraxaxoje.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/40315269271.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/72884076248.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/mibiwajonotemunifemepa.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a31826b4914bf81b30e8a8560f6cb4c8/95135450556.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/77971378094.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/lumib.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/nafalev.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/foruvakawivubuzedilu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dae7976d---dabixegufewotexe.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d6d9da80---pixuwofomululebalid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=contrato+de+arrendamiento+de+vivienda+sencillo+pdfPDF 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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10880 bytes
SHA-256: f1a752ddb9bbd437e92474717930d82d1351c20e4e82b423138150b5e949925e
font_02_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 18564 bytes
SHA-256: 3bc763821fc02c7e81cc0d668c8f6bbc5801ffd8c03a216c8b644d7aa13c2f55