Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc18cff984b8e56…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 16:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3fa8d8d49fdd3e72ca71501ef9ae791 SHA-1: db83d716d55ae72600bb8797c889aa4c94e5726b SHA-256: dcc18cff984b8e56b0d33715abc30ec9a51c5d38bac3e817d854e9c51cb2801e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, characteristic of a link farm used to obscure the final destination. The PDF structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://dalyanestate.com/userfiles/file/gotufabazisofizo.pdf In PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/93239488561.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7a3ad9d1---27143203893.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/71574239352.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202192135368177.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3a0ab09c---kamunisasemiges.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/12235371926.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/piluwurevibigotibas.pdfIn PDF document text
    • https://braus.uz/images/shared/file/bupidiwudalifufefejokoguf.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/lugono.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39b50b5f8---rakifizaxem.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/911269774.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/pawozorofufa.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/fubegavituvatilo.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/mitila.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/zoramuvodidupijejapejelos.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/31681785127.pdfIn PDF document text
    • http://saimiri.name/upload/file/793226156.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/140862207.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/44444454351.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/60240647623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cara+memasukan+video+ke+youtube+lewat+hp+androidPDF 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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 11288 bytes
SHA-256: 49156775e6301f880d8f94ffc79514b45d487f08f3feaf8aa5811176c3816df3
font_02_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 18092 bytes
SHA-256: 15ec92afcb58dab8a2f20ff2085bfbc2a1293b7d97b43d89cbdafd9fa5edd5c4