Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f0c112455fc6bc…

MALICIOUS

PDF

85.9 KB Created: 2021-08-21 09:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3fbcfcfe5a6d2d1ba4237f362b82a4b SHA-1: 83a65763aad9da32d31b1d328805fde9893b03d3 SHA-256: 22f0c112455fc6bc1f88e08db54a04e91c9b5a495cca86b1d695f480122dbee8
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 identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm indicate an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agro-pasz.pl/ckfinder/userfiles/files/47990075411.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ea136370b89501667c488208b90c08f/39056609606.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210725/210725200406848309or0tgl2zgwbm.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/70477409166.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nurimelunibimum.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/93f1h0ctgbab10r9fdsejte142/duvinurilikinitimepi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942efb522de---63864847266.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/ruden.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/68884729699.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hhne2sd8l40meeb32909don4n0/budiranusorekaza.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///828971616.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba984f12d10---kexujaxuguxedelun.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/12319695284.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/xitenuv.pdfIn PDF document text
    • http://goref.ru/files/file/gumexawevekuvivijexikusag.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/wilimepolow.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-17/20210517031143978986.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcan93m5ahl4lu7gdqd012ae5c/16604616458.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/83386426543.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/tuwot.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/73331396083.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/konulel.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/gapazezawotefedegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=zero+first+second+third+and+mixed+conditionals+exercises+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_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 18480 bytes
SHA-256: 77e1ed9ee5830122a8c859c4974f7feb17a84e53059605cd4f8c7f826652a425
font_01_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 10948 bytes
SHA-256: 2f443d9d88392e3eae2143f9d56fa1272aad7544d701a15ffe9fcbca0809aa91

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