Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ee58d914b30080…

MALICIOUS

PDF

96.0 KB Created: 2021-07-13 01:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5b9d4b69440bb223056d533a15c661eb SHA-1: 7c80c743309c5de042d94cc702ac76ea0ff721a7 SHA-256: e7ee58d914b3008084e7886081ea25dafb6fd2fd2c7a18a95f69fba2fcd62fe3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The embedded URLs suggest an attempt to redirect users to malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://aimhc.com/userfiles/file/wuzowekiton.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec70613ef---jofijoxap.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cae834d56d9---82907631482.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/81b4bd68806038822920bca98ecafd0c/3074404371.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/xaxiragajemamozutawo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4192bde223ad91982979dba7bdfd1c79/dobapobikukaxavutinar.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/wipezi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/dopax.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/4603416299.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/sisekipirojapav.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc45c94f8---64545849433.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/pl1a04t62epfnnmou6a59ogdp0/67837522865.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3gcgm0gtas2urm0uj3cg9dam9k/66127444379.pdfIn PDF document text
    • http://jaqalsports.com/files/file/21957141497.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1908f7342e---15330573732.pdfIn PDF document text
    • https://kopari.hu/files/file/58721610986.pdfIn PDF document text
    • http://jarosi.hu/files/file/16946849072.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/20531491290.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/910c8039e79a4fb0cb773fc40eed8269/kerifolepofasenuk.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d45e8b06c---46283629053.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2821a7446c---futitozisotuludevojuzubak.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ngssc8dct53lqgvs1tmm0dlm0a/zubidigobag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dr+arnold+murrayPDF 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_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 16740 bytes
SHA-256: 40c07921bed99c439378bcd7481ee2e5c0064e910319830fcb828aa7183ae425
font_01_sfnt_off000144e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E5 10136 bytes
SHA-256: 988bde52f9976db48471de79218ce025f3cc106e2b4d94923c04f735a0c471f6
font_02_sfnt_off00015b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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