Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9502d5c6ff907a…

MALICIOUS

PDF

92.8 KB Created: 2021-07-04 02:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 69777c448ac0d18deae8f7147aa14a0a SHA-1: 2cfc099f0298ef3abe025470b5dc7a9efb4037eb SHA-256: 4e9502d5c6ff907afbc719425b5513facca83640862fde888168ee15250d7b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=as+perfect+as PDF link annotation
    • http://clinical-pain.com/pds/userfiles/files/52360100684.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/50995415094.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qp3foah46ehcopt65195v0g4qd/73459565378.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/850f16e8eaa6b5e8b212627216005ad9/2196262024.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/53820347477.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/60138984071.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/lufanozeme.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/61336882899.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/16300898827.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/miwejebazopelev.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/37qi9g4b3vi4gkpqcm1ibqd666/menarorugilarawomudokonov.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nmedha50j8dacr848ev4sbu1e4/72894864858.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/k1psjd0lgvqko7k7hm6i98inst/juwiziv.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8414f47ea6d3cc69342db88b71e78495/zilavazotaxarixo.pdfIn PDF document text
    • https://scriptdd.com/_file/file/56340134595.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/57313364284.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ed7f7996c---69875720187.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/19564644358.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/iic47bbeo0gkkmng2kmplr3vp5/nunatibobeteravenevafite.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/65441340338.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39fcceb44---bezevawebeke.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/zegefije.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61337869466.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_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 10092 bytes
SHA-256: 8e5a9bd65ed27821d14616b9489885557eb9efa666b37b02978f2eebf420bb31
font_02_sfnt_off00013837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13837 18336 bytes
SHA-256: 02af3542af3f51a374b1afd017297a1adf2a0effedf6deaed68466e4696419a6

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