Malicious PDF — malware analysis report

Static analysis result for SHA-256 511420beedc8e52e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 17:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 448fa8f3ffaffe52e8b11434ee3c408d SHA-1: c59471c2865f3ef732573fc985a2321f12f6ca98 SHA-256: 511420beedc8e52ea508fed37858e7768586303dc5feb2620c14cb054690af7a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous URLs, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://liga-stf.ru/i/upload/files/42946962006.pdf In PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ks3hm7d81hj7pbbi7667pp58b0/56618984470.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/gdnv1i1v5u1hd6prvsifv134gv/tirurojez.pdfIn PDF document text
    • https://primer-spb.ru/files/files/25907609450.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b02a75d8---vovamipivuvifizezenenuwu.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/90966191454.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/91918745165.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/58976733392.pdfIn PDF document text
    • http://asfalon.com/__files/file/zawefaxeduvemifozovadudul.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798876efe43---50688033472.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0cbda3964ff6aee099ab5cef07d757a1/97118179485.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/45137286173.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1065472914.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/68747528444.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/doruterijulusop.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/dea8ff2aa3b578f78448746e2f3cb9bf/9915187039.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b67b3688e---2021436655.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/97894970113.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/63672485668.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/mefuvinilezavupikedodugu.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210903_43E4063DBDDAD7C4.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/fokazibedafu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16073021fe68cc---forufeve.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/1c372628bf8f74fa08e9ff42d8b4c4c5/86702801683.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/54693680587.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/zozagubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=electroanalytical+chemistry+a+series+of+advances+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_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 11048 bytes
SHA-256: df7ca78c4e881d1239eba5337f8204d3cc9086c05682a118299abc1bb66825cd
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 18512 bytes
SHA-256: 76a0a5882ea4fbcafe7e9b50325616ca1a9102e0930b2e74a05783a0099e4d0a
font_02_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1