Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2dffb88b871865…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 12:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4f2c8b737aa2ffd1f17a96c7c38d39e SHA-1: 543c3b999b93f77e7d1993a76dec860972d6d62b SHA-256: ce2dffb88b8718654f5bc1cce41159e03d05501d4fbc9c28bd6da8cb6a99c48e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. This pattern is commonly used to distribute phishing lures or redirect users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87c19cbc6---xuwube.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eea67785e---bajidolodudolikupuj.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b836a9654---21107504393.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cef7958c4---53564673855.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/xiruzatuv.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/badojatusufumarigoz.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/6604189813.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/22588173874.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5affd6480---nemovatevuvaxewoxutu.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/91604693235.pdfIn PDF document text
    • https://tigaintan.com/contents//files/32943246669.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/51751210469.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e16827363---91791446251.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/43391350559.pdfIn PDF document text
    • http://ciskmv.com/css/file/72495964065.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/8199474255.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/bhpvefd42tc9aac4o9o7jcr7i1/29358473320.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b206a4db27e---xijewozokibusotesubajof.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/23056101694.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/8372152640.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uf5civbojnlct37kqadee8k7bq/fivaramopiro.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/giripebos.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608263a90675c---wakofedakababupezofiner.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/chqthr1fq99vcrcdm3uv9d97rd/88498665176.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/46635162115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sciatica+exercises+pdf+spanishPDF 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_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 18840 bytes
SHA-256: 0379d8390431507636a58ae48ba06a6207099086ea9105d70ff1475c1fa8c284
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 10728 bytes
SHA-256: 54e7dc04679dfeed0c6bdf58e9c0825348a568c1efcc96b29817d33ff2c385ef