Malicious PDF — malware analysis report

Static analysis result for SHA-256 1331cc1aec148b93…

MALICIOUS

PDF

68.6 KB Created: 2021-09-04 00:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3cbc28259c883cac16a9a36d289e087 SHA-1: fe047db5beb1a1749c6246a4a0dc0b1c63d6725f SHA-256: 1331cc1aec148b937a1e72f2b5b3a8fe028c978661dd5dab7b26ebed32ec8eee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware distribution. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of embedded JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=types+of+thermometer+with+names+and+pictures+pdf PDF link annotation
    • http://mosjob.ru/images/file/83934536052.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/16226923693.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/jekobapuzisuxin.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/lifaduxowiwalewexaxexineb.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/26971595866.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ae444387b33530287dd3708dde71a742/waxaxowijofuxerumogojaka.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210813202138984.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/wapajaw.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/lubugujas.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c9e0eb643ce90a71be3532114ec5f938/nopupibeda.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/53a3c88069eb37d7a04b471f99db914f/89712739069.pdfIn PDF document text
    • http://e-district.org/userfiles/file/77569414938.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5refd7s6cqkd7oakmt3famcikj/pevela.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/68cdc8793f7bb14d95eee2c505d7647e/28782180732.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5c79260a---timosipadovusobixikirugod.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/2b53a4b516eaa468b0f9e2e2874b060a/60349242561.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/folenanujikavuziminaguxa.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/73307953411.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/eo7nb46367ac3jouq94dgc956b/diduzutotibi.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/64239357690.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/60900221501.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/10290764224.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/39779004518.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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 14104 bytes
SHA-256: 7dc5e438f03fbf8694b0de7a9ded63be6dfab46f5a73050538e3b8beaa0ab8f6
font_01_sfnt_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 11104 bytes
SHA-256: 122e86e9f5627694983f8c2cf20ff56c8f317e9fa1adf744bb2ee074a6742318

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