Malicious PDF — malware analysis report

Static analysis result for SHA-256 49428f89ef4f4ef5…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 13:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48d06a9e1c8d21751c739c2bf74bf026 SHA-1: baca14779414c9ca29ec6e7694b18eb7db389d99 SHA-256: 49428f89ef4f4ef5f8eda9dbefbc5dd236ea7b45559d29248ae98808563ece33
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself is heavily obfuscated and contains no readable content, further indicating a malicious intent to conceal its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://technology-mp.it/userfiles/files/50082726520.pdf In PDF document text
    • http://dienlanhhuubinh.com/upload/files/deliwu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ed31017e5---tabama.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/9757114885.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/24pcgh334ojlbmqi4h5gbtfeu2/87194645235.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/99976308275.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/fezeketafovuzavijobatuka.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/1740963545.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/afd583b7a918305d360fdc0ba34caf21/lusuponijojebu.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/xuwizuwogolavepub.pdfIn PDF document text
    • https://kermanrooz.com/img/files/63699969315.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/batepatuxonudunasoba.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb77c1d01---24407506291.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddce1554607---wobasogujesudazebif.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc26a283bee---vukibu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/jusoditutamesanes.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/tagadinoxub.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a220bec245---82922533632.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2d4cf549---62718188380.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/81232496209.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-4/20210804094812625852.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf102073bf---77636225223.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49ed996da---fidizorubinekifajilasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mkv123+bollywood+movies+download+freePDF 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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 11252 bytes
SHA-256: c2a5ea4b4a00b7169e17b59531559d69054b45fa83c0d598ba8c50fc44ad55e1
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 17148 bytes
SHA-256: 9c9f0b04d5527300831bf230cce0282d8561aa09244cb94177af659a1f5b1fc0