Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2aa755ec9c6106…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 23:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d3c185246d3151ce41501ec027a35a3 SHA-1: 20cee668f514207416df53b4f9d839e2a352fe8e SHA-256: df2aa755ec9c6106b191b75b281fc9228ec60d611bcb2f56ad9d32c4faacce21
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161045f1c115c0---ridezejewujiko.pdf In PDF document text
    • https://giriconsultancy.com/content_files/files/pilejepof.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/dokosopovadifumex.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/vulajipawata.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dge0uis9f2alt4rl1ipsqjosv6/49731010833.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/682bec0e42b3c2b719f9cc6a99c25235/64846430969.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tabupawasevumevuluwizitu.pdfIn PDF document text
    • http://belloverde.net/emailer/file/kibufenejuxalozu.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/41074520094.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bd265fad167d913f1ca987b376f900ab/60697669690.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vn3uvp50b7jceg7dtg4t7tjqk0/vutefesixa.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/75880038808.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0athj0v7inhujhlmrr2upb5uh4/29895098928.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/77549768632.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/49433517355.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/48287995218.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/68825923399.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/7924538494.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/wowikedezaxebesawubewolu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xevimijawixototaz.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vigonorijoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+oil+in+craftsman+6.5+hp+lawn+mowerPDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16980 bytes
SHA-256: 1b45cda099311bfcfd2d8496c6e7706667d4345d7797473c5d9f6089967db149
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 11372 bytes
SHA-256: 23054b6a96fd4ad7466ea9391edf0bb6246e7ba2729fa8f728d8aaae34c78268