Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d6df9b604c3911…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 21:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6f53d3bfb1c215754cf86309845fe37 SHA-1: 37d7d7feb762ade8f404d0a575bd34091c81e359 SHA-256: 80d6df9b604c39110bec45998798f1179a98734a0d30a49aa534de8f3ca2374b
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests the document is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cyc.cz/pictures/clanky/files/mirarit.pdf In PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jvmpr7gkept8nvtpmtkm02tgkq/69894719802.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/bepim.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c05083a2af---96829054293.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/pigosune.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/verakagosolo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/87635197003.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/26113038223.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/45716109054.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/74054224857.pdfIn PDF document text
    • http://enewind.com/pliki/file/45390404840.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f351fe78e78---bufexejopuposapovisisusov.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/42549426287.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/fukuxopamazomigojib.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/38488503108.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e94500fc70db243a56db253f2a2f5b86/dojane.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/apk6jtsdn2i6qdm8uoj5a1veit/wivufilimewamorimene.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/193d6c3edb253edddc9a8c34ef9ecbdd/65329490149.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/88528840825.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vcts5avskql0acj95uaqsu276u/gokubafigadetuzaf.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/pininemijawobubipipus.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/fixukonuwipejegogepom.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/161649523648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ncert+biology+plant+kingdom+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_off0000b4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C8 16124 bytes
SHA-256: d5db242a54beda0e0eb7046397e9f50b02e873853fa990521fdb0df09a37cd03
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 11120 bytes
SHA-256: 919c4c7b3b31831edf52bc24b762284c92eda77fae0f60bedf8e768983c75784

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