Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1cdbe16ddc48f4…

MALICIOUS

PDF

104.5 KB Created: 2021-07-21 05:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b063eaad5441a3097ec2975dfbc5e86d SHA-1: 8eb4f6957d7ef0e9782ca1cfe828038b10366ec0 SHA-256: 9b1cdbe16ddc48f404519f46c6c952a7ee8cb31281a1e0a2aba127ae5bd946bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the redirection to malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://ludifrance.fr/userfiles/file/tewagulelanita.pdf In PDF document text
    • https://2acontractor.it/images/file/xokidawunipomobaxo.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/boxuketileduv.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/zepubeberolimavomosalenax.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16208734645337.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/lifatokafalikumukazam.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/16770873589.pdfIn PDF document text
    • https://tpk-m.ru/files/file/84202475034.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/24247297970.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4b52385b9df87e9717a4f5144b051be2/7694937490.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac22a171e4---katevalesapogev.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/59690347048.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aaafff508e2---44259268895.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5834b000c9de9c460adcde34c0e0bdcd/51161744509.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7dbd2aa30---70239406332.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/pivewesodaweki.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67e94d7a9---ladidelamepuranuboxam.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/37193711287.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/wapefojobotigaban.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2259f49a0b---najutonikowetebesawabe.pdfIn PDF document text
    • https://cooperspick.com/files/38821794938.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/23348914403.pdfIn PDF document text
    • https://bloomeng.com/uploads/pejilanawaperosajatem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hard+english+paragraph+to+readPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 10664 bytes
SHA-256: 141b0600dc4d03a91002fa6370034c32f0d8f415944ad1cf2dd033612520a220
font_01_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 16296 bytes
SHA-256: c49e0c55baaf50f641d413b402d8a52c0d9da10c927b26e1bad91f57f52dfa67
font_02_sfnt_off0001491b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 19608 bytes
SHA-256: ceb5c33198b12e9b01d75a8d54f7304f239e39718e760d80988057dcf32b5a00
font_03_sfnt_off00017c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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