Malicious PDF — malware analysis report

Static analysis result for SHA-256 89da2ea41b810d89…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 12:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4e96b29f3c66ef76aa7e4484f77633c SHA-1: 7e3f77538f1a4b973d6c1e6ea747a647179f2e36 SHA-256: 89da2ea41b810d8966a0f7f59ee4410eb338b0a05f816afc53d82d634ce94ead
164 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites and other disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://smidgel.ru/uplcv?utm_term=saraf+spinal+dan+fungsinya+pdf PDF link annotation
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cbd0de0ffd8f1c0978f7b6e0fe5e79ef/wevugif.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/migikuk.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c43907fc1337f6b59e043fb7c7e93c29/93915961597.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/linisomejitupegijeb.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/mibigabufizeba.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jg35njfbab11q2b5f49f3q8q9m/54158738083.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/84662575796.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d71c34bb195---72988959008.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210807115810.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/73516718708.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6dcec03b---vadajisadigidakerololebi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/02ae7d5287d2c9066d8fd9f948b0caf6/zejozizolobizevevofetamo.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/32598744083.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210620085427.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210619051849.pdfIn PDF document text
    • http://texmet.pl/userimages/file/82446540127.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ba821035f84e000f729aa8a9f17272e7/zotegizovobovonitojexa.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/68034098534.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/78474100183.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/40222176120.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdc3af945---14891744995.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/26615644337.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/wipuvotelurasedopavax.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/xinazilubamekaderelivosi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751747d74c3---begeridifeme.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/mosadopuwafofi.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://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_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 16916 bytes
SHA-256: 195b6922ea2e16303b182bf818cbd0e6fbfabcc803f87f4dc3d54549bb17de2c
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 10612 bytes
SHA-256: f5c5602701eebc1d2494abfd432abf04fea820bd8cd83fd57ac53b464debcd73

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