Malicious PDF — malware analysis report

Static analysis result for SHA-256 890faebac8a1a0f5…

MALICIOUS

PDF

104.2 KB Created: 2021-08-16 20:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa85981f05f0ff0b48ba680c8c024a18 SHA-1: 26b18a9b7fb4d559648a0a3db4fc9fa7a774291a SHA-256: 890faebac8a1a0f59e551d0707751352d0ec282da783ed37ddf6a99c5dcc7a37
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress uploads and disposable hosting sites. These links are likely intended to deliver phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://niestachow.pl/data/aktualnosci_imgs/file/42533495454.pdf In PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/xuzilikagotutekeze.pdfIn PDF document text
    • http://erex.hu/upload/file/lekepijo.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/zemiwawasonud.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/254bdaf900a2c342966e63131b211798/kekefumiwawug.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7lgepk0fe6dfbj082nk16sm75u/34344643953.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/96e634860803a2d19e63f588e22dc72b/newatifovimovesopil.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4b9ac9b39d01c712f24c4225dbda5761/29440406492.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/feac678c224d1b176759a17a5f79bddb/koresuwabefik.pdfIn PDF document text
    • http://simonide.org/userfiles/file/2232392892.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/tiduriji.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/93844713730.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/pejudewo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847d5d5577a---wogazuxabozid.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/21492282381.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/7017859356.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/58819330083.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/xuvobodogati.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d52b7a76---25655693953.pdfIn PDF document text
    • https://digireg.nu/upload/54482844073.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e4d5b5b4---44888249851.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/444919017.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948b6156a79---zedipubamekukax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+wear+tozo+t6PDF 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_off0001349a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 17584 bytes
SHA-256: e4a629b64cd0f9ae9820ad9cc2db475e96bc9b2581126ce0f32ca15d44429396
font_01_sfnt_off000162f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B06 9996 bytes
SHA-256: 1b845cdb51ab20fb7e11e07e2ede1f7da4dffc198cef663b7d0b34b0158859b8

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