Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc4cb3b1b6078f1…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 20:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 18d6a0d86888e79132952f0528ebfac8 SHA-1: 4e90aab525c03dadd8a4d3c86e903adb3bf31df9 SHA-256: afc4cb3b1b6078f17a6c6aba26af7bd0c22fbc00371dc14228ac0b952ee93cb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://egokituz.org/files/galeria/files/vojimef.pdf In PDF document text
    • https://thokhoavietnam.com/upload/files/78707049480.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d4fe78176---90483762215.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bcc20913822e9ad4e751ebb7b0b68401/13739462426.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/504tj98ipsrnnkjpcbre87vabj/siten.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ae855c49---75241646145.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/xitolebuwafisedokaruz.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be1d6d1a8ee09c234c4a8359c4a1562c/ragonoleviguwekaxefe.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/wuwasujulekibifojegowep.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/zomugezu.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/kobovunewobudinaz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3e98079a8---75796622975.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/27472068197.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/mipukaruzumezuwitufomosiv.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f48d75569---pevakipawajitijevot.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f21d17695---65918096541.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/29889223800.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad947111da---69037789802.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/13725130202.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/1819753965.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/11897800269.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726ce592050---2656812697.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/90481101312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+do+i+need+for+7th+gradePDF 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_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 19816 bytes
SHA-256: d97b28c42da0762bddaf0cdaf47fe03c0a5b0949a1e73bcd8ab27e458d62be75
font_01_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 10460 bytes
SHA-256: 459ccad074e3b44d39c9d4e8b248a27feaf8d7b0bbf97ac4a9e691a634973cc9
font_02_sfnt_off0001399a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1