Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e91e469cdbaa2b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 20:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b5cd8bcbcb127626f6d6b6fcf3f3c82 SHA-1: b0c7d5a03e4fd439915b41cf1eddda452d1540f7 SHA-256: 24e91e469cdbaa2bf533d4ec62c523f9823f102ba9a1d737b05fe9b3c86f2ef1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=this+that+these+those+worksheet+elementary PDF link annotation
    • http://angelojrobles.com/admin_initial_test/userfiles/file/madusevabigepajate.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/45222421928.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/20811847353.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/59835022683.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hinmss427cp8ha83mlbo9ers5u/janomawugunofobubu.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xodibudefutifitefo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/visutinagopolisixumipe.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///93085326252.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/86ea1a51f77198ca450018fc22d00464/levate.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/443566e4a924448b968d28a9fe3f47f2/88029364664.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3bfae071a626689e1f8738cb3fa6d809/dizamuzixikidon.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/75310418920.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25efb8ac0b---degufirifudi.pdfIn PDF document text
    • http://sns.hu/_user/file/81983513499.pdfIn PDF document text
    • http://change4best.ru/upload/file/pamexenaribopev.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06011d2e16---20575924855.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5isjnpdp83pf5q7ik8tqf74gku/33658360340.pdfIn PDF document text
    • http://flexa.cz/docs/file/dadogejomuletexemizuje.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/65a2c398c6b779ea030bf80c1bb7c1d4/fibejedafe.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d9a923ba934546150a3189d65bb5f99a/zolepopelew.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_off0000bb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB07 10628 bytes
SHA-256: db3d3d36ea4e58c98417368850e96ff94ca455872ea17bff65d3711727973321
font_01_sfnt_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 17276 bytes
SHA-256: eef795fefd189d1e2fffa37667bd1435f634d52b286968dfb9324f59de2835f3

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