Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcfc79483df1ae6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 18:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e42f41ef3b6980895a44e6f2ba964ad SHA-1: 1a1a76ca06abf2cab28a4afee02284ddbdac408b SHA-256: bfcfc79483df1ae6d22dbda721b36fb3b6a48742daca18ec966e179398821fc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=pokemon+dark+rising PDF link annotation
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/merumatemepaf.pdfIn PDF document text
    • http://methese.com/upload/files/37962027922.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139137b7209b---xutipijoli.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6d2a92cf---fuvefixabilob.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e504875cf6---bubopa.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/39932062383.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/gasalimivirepivudoji.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/sazopixeli.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/lelunexubomikil.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wonemewoxiwapugajewebuj.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/foradisofosori.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/72997397147.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/48879036128.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/73909424430.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/megujexudatavoziwe.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ccb85558---zonul.pdfIn PDF document text
    • http://mayjack.com/upload/files/mumizevu.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/betomarawokanujapofax.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/99847661909.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/93738083919.pdfIn PDF document text
    • https://ccskin.com/geektic/files/21231374488.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9a279378e113080fc682a987c7fc3976/xileb.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/42611249173.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/29322013594.pdfIn PDF document text
    • 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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 10540 bytes
SHA-256: 71ad45e2f021df8e325b1a6c0ba96891a19d9045dfdbea5baac996404bc4f056
font_01_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 17732 bytes
SHA-256: d1ba3d1dabc090c169a7b4484b7cc8661b6fccf1ece4748a6919db10f523297c

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