Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60dc716e58cc8db…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 11:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5954be7a8a4e8cbcc61d07a863fc7e3e SHA-1: d135769d46e2c778700955cc35a3d1a41977da04 SHA-256: e60dc716e58cc8dbc29680adf5a41cc502bb08f11ad679f20ce6d4decf7c4bfd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://www.pattyn360.com/upload/forum/files/jijivari.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/vorepokarafax.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/mapisovomoworakikulu.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/nudakabixutob.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8c3giq5evmfgdqne8lnr6glm1r/fetoker.pdfIn PDF document text
    • http://builderall.info/userfiles/file/50937708650.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/c468c7086f21c5c02929e577aca5ee1c/nimozux.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/31675749106.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca013ff55f5582d7c9144bec9d6a2044/xaximamabikibifirebo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333af8b8a2---favanapilopuwobize.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/wikipukodunenonenamo.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/xafinezubosidaruke.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5661bbc31fe20d3be5263766ebd1e107/77294855734.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/30829164197.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a77ede129---91284064762.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/lovekufidufisavikagu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2pdrlh8o7nd0mii0oaf8toe56n/dijoxuniwuvetopu.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/73075914038.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16290641811f774fb7d2d11701d466.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/68f82338b59f2f9943a13d53d2db4489/14601559836.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/be31567093e223cafb19e7da50a071da/53384597707.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/21314303353.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1628709258.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/bc00011c8929485537285e9f183c777e/61411455087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=newton+motor+ability+test+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000eb7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB7C 18420 bytes
SHA-256: 592bb09d3202e17b0b09272c792182d8e6c59c27420646a441ae20eadc0ed1cd
font_00_sfnt_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 10976 bytes
SHA-256: 7cc9a7c1794100d87a61fff45c43a3b3bf9ced582b90cf306d56c299b07bb51a
font_02_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16796 bytes
SHA-256: b15246134695c697191829de6fcd40c45a3613306f2f037fd878d3f0f9e2dff8

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