Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae71e5893f83c1a4…

MALICIOUS

PDF

92.5 KB Created: 2021-07-18 20:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 221387394d3f4197a506520ba21f64e6 SHA-1: 7e4456373a2d32c46d18f7fa1c6849fd01af6b12 SHA-256: ae71e5893f83c1a4e5139f5e8aae12b61246edb3d9b192b750b80caaf410475b
156 Risk Score

Malware Insights

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

The 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 upload storage, suggesting a tactic to host malicious files. The PDF structure itself does not contain readable content, but the presence of numerous external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e2412b7e6---79265991546.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nijor.pdfIn PDF document text
    • https://papiratisk.cz/soubory/ponisavorujegasavuve.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f834d95a49efefa2efebf41f2a0bb685/modosazijefosudujot.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/koxaneligige.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/suxodidesanodesexuvagif.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160792fbeb0010---47897265524.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/72886927766.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/39753694878.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e7c61fb7---gopov.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e6a2e6d6ce8f88d84d4ac9bfda5d9225/sijike.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31681884e2---65733516289.pdfIn PDF document text
    • http://fields-on-earth.com/xavezixepilo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/19886998503.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/kawib.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/71053d1e292040a093840dfaef228c1a/74158279480.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/592e91dd0cebb69a93370d020fb4ac33/kukurututabo.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df447fe84---vovegimexaxaguno.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/21513512951.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608174ce45b61---bimegofumozukasap.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd093aa97b1---nalofozagupitupetifisavo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5135393fa7---76848138367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=blended+learning+approach+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_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 17404 bytes
SHA-256: aa4c176126f47639ab28d6b449e151b1f92faefe914424c5c2396f404a3d751b
font_01_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 10688 bytes
SHA-256: 8eea7cda65a7afa15fd2b66299e5aa569f952aa138b27103df3183d070bccbac
font_02_sfnt_off00014cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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