Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85d7b42242c1c03…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 21:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c924a6bbf800308ef4231ae1c31f77e SHA-1: ab1af4946f2424ffe3ed4871ae87c0ea14d8f300 SHA-256: d85d7b42242c1c03d0fe93b22faa8f842223b9b45da0e48b1ea06d61db5a9be9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest this document is designed to lure users to malicious sites. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3cv75gaj88b9g6ajapf2fh84db/95513532337.pdf In PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/91194739476.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/59a8d1f809cdbc5767f87fcef3c898af/juxomiroruxivujiluf.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dbcecb030c82e390d376e39c1d4bd022/26401918743.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a93bb5f78---jugijulugexowivuso.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070481604152---17906388944.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/sefudaxadokozesukazix.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/fabm9q237thrbbvohpr1dm9506/wubufoxipubawilegixut.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739e38ed88a---32802622786.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/98687626279.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/76530102294.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd195a395---ruvasasubiwilakoju.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/43852609815.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///7416042146.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/54183765881.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210629115926.pdfIn PDF document text
    • https://noddy.nu/images/file/93037976754.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t4esa2ph3g5n4e774dqai1d7t0/tetabirirufefabul.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607272d02286a---20864646916.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad6621e224---sugofo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608062642eb8d---bisijijikagofodamajule.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/niselijem.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/88784676001.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b34253cc584---82675028421.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/g798bvo5ifelg4kq2s0t5l9bu2/63042663312.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/48d7d24042a21fe48de7ec22938aa41c/34277950267.pdfIn PDF document text
    • http://kme-kme.cz/files/file/vifumaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=among+us+free+to+play+pcPDF 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 10928 bytes
SHA-256: 9cb18f494e04357a26e628285628450728ec31fa7b2be243c13125ee7a233d0b
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 17280 bytes
SHA-256: 31911d8773e41abbfeda039969cd15fedc7fea333ac7a1792a577a849a07f02f