Malicious PDF — malware analysis report

Static analysis result for SHA-256 1263ad99da7d5bab…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 04:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b1dc45f89c06e19884ae07e8a500398 SHA-1: f605832c4efaaf2f6260b31c137cdc461799c3ee SHA-256: 1263ad99da7d5bab9716bf52064316f96ac5e744be643e20279a80ba754d437d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/d5kptenkgk8vu5fdelbmksj7lu/2568805808.pdf In PDF document text
    • http://gamecoast.by/uploads/files/65530121399.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae24bef35---41475439085.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109050436223991.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8ef950544e146b248b5b038fd44b9ef5/28434911523.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/tagofuf.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/71940547992.pdfIn PDF document text
    • http://forti.in/userfiles/file/5544995396.pdfIn PDF document text
    • http://agama-rc.com/upload/files/digujegafefajojetigozivi.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/maguxivozu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/xutefakotasuk.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/7340504358.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/jawokevinudirotaxiwag.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/7642799702.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/15907756220.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/97225410720.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/gagaxapebisuma.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/sapepalin.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/fijitikuretamukitobakuje.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zuxuvipusigolilomo.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/bumejetuviwibolunowalape.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/zofigit.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vibixofuzenutiredupure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+galaxy+s20+fe+5g+vs+iphone+sePDF 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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 18028 bytes
SHA-256: 492024bdd943cc348a72797778226f3f030f5e845290fc20ad681d9f7d4f7c08
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 11440 bytes
SHA-256: 86a2a44ed13500a93e22874f73ba40d257255c778f98a80b5882ef7cda2ee2f6
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1