Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b591d91667848d3…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 14:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4b38b836738fa8ddc785182ae75117fc SHA-1: 7131f9f93f5744824f2f333c62953aa36becb8ae SHA-256: 7b591d91667848d34f6c10a15a2a84fd11397d9e839ee3e7ae42bb4a7d86e33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e5e8975f---datixibebabixanipidotu.pdf In PDF document text
    • http://kamerton.nl/clientfiles/77844558259.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/sogemekijibelubozupasif.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/69711591686.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/46950299072.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/23685269797.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zelawejirofi.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/ruxenodetepetuv.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/48d707c529f4b0447e23db1ba386778a/miseruparuregalulajux.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/71bb0b5da530c5f51c06bc229c2e169d/benomafazanozomowot.pdfIn PDF document text
    • https://festacontinua.it/public/file/60604094144.pdfIn PDF document text
    • http://platcometals.com/images/file/44414440069.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/74297062705.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/813772e4c2cea61a903b38c82b8d41dd/11635949882.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16120866ad73d9---pikojifasadonor.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/33523631644.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/16807623645.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1454b728---5863581102.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/jotamomiramoj.pdfIn PDF document text
    • http://polkovnik.su/upload/file/pedesivekibezoxowafij.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/98368048151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=stobbe+condensation+mechanism+pdfPDF 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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 18572 bytes
SHA-256: ed4ffb5e4408188b2ca565dcd352a05bb64d4866017f17f057949e5ed5fafbd4
font_01_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 10952 bytes
SHA-256: 5de69b490bc22e83062150be621eadbf19c8c0c42f6a06b233f536052e0b2bde
font_02_sfnt_off00013e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1