Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a201712ea79835a…

MALICIOUS

PDF

104.1 KB Created: 2021-10-07 00:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 28be9522a08fc807c1a4d4f475374e75 SHA-1: 8b3d86cc6ad9106fd63a4fdef9bc6ac1a9513052 SHA-256: 4a201712ea79835a2f7c4ed7aac84d21f84c4e959583514eb78f120d055e519e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=difference+between+monaco+and+monte+carlo PDF link annotation
    • http://xuanfe.com/uploads/FCKeditor/file/karagirekamuxelitugi.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/padokuregowarebu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/rixapus.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jobugivegadorirakudavev.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xikanomiboluzuxalamaf.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa587c820---badebafirato.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/velesupi.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/58105543774.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8f4402f3ad9ae60ac703b6152ab7f904/14749674204.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/brmilshkpbppakccmv9taqn0j1/sewazomifedobod.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/tevatekerivedajekire.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kaviz.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/tuwupom.pdfIn PDF document text
    • http://metallpress.ru/files/xonewogemafakiwanelubix.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091910514730.pdfIn PDF document text
    • http://xtra360.net/campannas/file/ditanizukuje.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/wilir.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/lemotivudof.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363a8a1ba9---23655397657.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/kalemisu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/rolanuladisoroxi.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/90533432967.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/6703708160.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20211005213636.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_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 10696 bytes
SHA-256: 3667b038db435b11ba7497285cdf10a1ba2cd3a5048cf2a002b8ca8b8fe0fd92
font_02_sfnt_off00015976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15976 21516 bytes
SHA-256: 661a664facec9fbe2bccd454ed114330f7c8f392b9ae6163a435876474d1aa82

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