Malicious PDF — malware analysis report

Static analysis result for SHA-256 85410d09c3daf149…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 07:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6c1259ba17099e9d3726dbf16ee0d24b SHA-1: 0023a78b19bbe3a32e103fef44b32409f0930139 SHA-256: 85410d09c3daf1493e76a93fbed179657a0233bb1ba99e3c0d502b92f6e42cfe
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://opakowania-loga.pl/zdjecia/fotki/file/ponujofiniwojasapoguta.pdf In PDF document text
    • http://magicfood-cn.com/files/20210914122052.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/15236292452.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b5fad6beb36cfdfb53052a314c38b09f/86936347416.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pejes.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/16025371524.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jelirul.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/ziserox.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9f02d518eacc8e083cb303a528f3cd47/fefuxakoxovuwavifezar.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210907171507832745.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138891842652---namifodupesigosetudaxo.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/79498925788.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16148ce3f29684---53788654042.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/58938551858.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/74aaa5b7d33c8ebeb90ff4feca6a6546/bopovikilaferuniji.pdfIn PDF document text
    • http://juha.be/_files/file/39919422474.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3b395d8ca13cb02d8605d732c056959e/fodusew.pdfIn PDF document text
    • http://specimport.by/files/files/nonejolazufoxafuwuvameza.pdfIn PDF document text
    • http://vipdiler.ru/files/file/63801023719.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/80653128144.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/dapomiwabisowadiled.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/liwifutifoz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161478a046c97b---dureperetitoxofetesoni.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/59242582987.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/ruzimimonusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=find+radian+measure+of+central+anglePDF 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_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 10896 bytes
SHA-256: 646ba88a69969463391c94f288716fe2bdeddb0c23195678c8e65cc24a6077cd
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 18352 bytes
SHA-256: df917c7f06457f39df8a26888422bda63ee6a57338a33bc6ddd20b18ff26fbd5

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