Malicious PDF — malware analysis report

Static analysis result for SHA-256 599c2126724c3757…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 00:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c73f17cb1a9b926d6cd1d3e18c77407a SHA-1: dafd1b864ec2f4d50705f02978f4c5aae3acb77a SHA-256: 599c2126724c375740c8b011d7420064c028987a00a8e7812592cc970b6cef89
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://interreg-ipa-husrb.com/downloads/50549436543.pdf In PDF document text
    • https://alate.org/admin/fckeditor/editorfile/56711081689.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145d14258993---winod.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e268ab8d43---66061530090.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/xiputitosadakufipafube.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6001bbf5b---93965433328.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/wekiv.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zivagevafesapegobivepofab.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/49756957028.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210907200516.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3379d9a2---41815622678.pdfIn PDF document text
    • http://laserinnsbruck.com/static/40650779925.pdfIn PDF document text
    • http://hevolta.com/upload/file/57480851895.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ef44a4247---febexux.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210914184843410.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/77382748358.pdfIn PDF document text
    • http://fabtur.ru/upload/files/17070074799.pdfIn PDF document text
    • https://network-italia.it/file/17287927700.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b35504c3---pipawuzojoxazomizamodad.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/gifuxunixibakidazawabazi.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/84219921922.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/sabefime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+hidden+cam+app+for+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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 17700 bytes
SHA-256: 7fc6958054833bb992b4f2a514695ea7a5c8b8b869829fc069facdc5cb00eacb
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 10892 bytes
SHA-256: 55110741f71e797cdf0662d43715f539e21c7ea322cfae72c7d2d6523549ee02