Malicious PDF — malware analysis report

Static analysis result for SHA-256 8830dc36b4757281…

MALICIOUS

PDF

96.0 KB Created: 2021-09-06 17:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 691948c4879bbcdd829d74eee75086dc SHA-1: 57a1ef64a3ee227d69e8d8b764df525aed5ef32f SHA-256: 8830dc36b4757281106b87ce01eec48cde9b91ff7503683fb257aa06b43dbd64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://centrorevisionimonregalese.it/file/23762707765.pdf In PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wukitumixofunedepupalivaj.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210621_EB9934E1E6F2FB8E.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ceeacb18a256aba818fcbb193b6a99b5/juromuxupavawametiz.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/dusetukevo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07e63222a---xikokusixo.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kuzusuba.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d119f55ea2---65330848154.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed3beb068---vamiwabatipurare.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/12208555224.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/govamam.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/99212174031.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/52980380883.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d373b3b7---devomebazelalobivapavemo.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/8741436090.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/6791364079.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/jawopabilizurow.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c39bc420fc310d7e1dde4cee960822ff/gozexexedudujasifefewuf.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d680ad1f092---87722956555.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/rotibezorafub.pdfIn PDF document text
    • http://rhondachem.com/d/files/jobosuz.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/bufusasapurufuvileki.pdfIn PDF document text
    • https://laps.pl/userfiles/file/91902296101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=joint+stock+company+aims+and+objectives+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_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 11168 bytes
SHA-256: 6ecc37dfaa62151984d9d4932ab9d3aa14ae7b36f38d4f148afb2508c24f61fb
font_01_sfnt_off000127a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 18628 bytes
SHA-256: b9c210fee9cd56bdd1af1bf727008bc7e1ae52ca5328d8fd1b33ba0a3193241a

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