Malicious PDF — malware analysis report

Static analysis result for SHA-256 f052cca395f19b7f…

MALICIOUS

PDF

85.9 KB Created: 2021-08-02 06:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72644130645efffa1a83f8b21a980622 SHA-1: aeae97f937ae45aa5428d91456083b7e358f9c28 SHA-256: f052cca395f19b7fd876c9f06d3bbb8bd10e7ffe057ee8b6a251282b3c7f80ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://artofsurfing.com/preview/ckfinder/userfiles/files/76364324612.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/28341520267.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/widuzevuziguwox.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5a26a3cb035fa4a8af6e6de151c1df4e/13721977693.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/heqgbo0ju620bkvj6hpr34gp2r/92234563066.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/muxoni.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/89920801924.pdfIn PDF document text
    • https://digireg.gr/upload/66350411457.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/3865278220.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06edbbcc6a---98168856464.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/35c0cc2022e60b2e011767d11541bfdf/tirob.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210529_DA05DDF7532BB932.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/gunirezabiwujalenoxevume.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/57282836453.pdfIn PDF document text
    • http://demkapi.com/resimler/files/xokapufinakuwawexeruxo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4e4570c3---92316600685.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7e6e67bc2f36ac38fe7f8e423954dfbe/somosulakigobur.pdfIn PDF document text
    • https://airshow-bg.com/file/86255442898.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a995f217a---39829959039.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1e1u3dc9jgau97vqjp3ff6620c/54494779513.pdfIn PDF document text
    • https://bloomeng.com/uploads/15889726680.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/23885006675.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/94585774899.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8b4bffd7---didewen.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1627415692791670706.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/kozizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dreadout+full+movie+subtitle+indonesiaPDF 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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 16640 bytes
SHA-256: 2048baa5e6672b484dca86cb0dc6197b31439a9608cff9422faafea64a3bd06a
font_01_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 10824 bytes
SHA-256: 91a9929919656e1c00ff202828d7fa32ff7cf33973cedec3535127ff752ecad0

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