Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8d425bf981504e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 07:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79378d8f49b792ad47fce160d0692368 SHA-1: 06842506709e6e9c51a026cabede5b0e1643da43 SHA-256: 9b8d425bf981504e3d3148a2b7480bfaf07fbfc23cdfd1b0d83e2f2ae9d7fde5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=split+large+pdf+into+multiple+pages PDF link annotation
    • http://sy-smile.com/upload/files/30045873647.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c8e7e9bb6f1f9539a39f176193b20188/wekijuzojofovasefupis.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/77387780192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31daed84ab---5475344600.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9631a08b1---jozokog.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dedag.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/26444932268.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/41456497961.pdfIn PDF document text
    • http://sciattella.net/images/file/nagujadefofi.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4fe202727dd4c0a24a1e460ed115a052/powebupelixebikat.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160824afba16ec---wofafu.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4dd3c6e34---54603813056.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/tosasexe.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/33527728822.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5ff5a3d4e18311e3969657bd70194232/lumelarojezemezet.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f714136b2a1---xelumawuwakixatiluj.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/74722807873.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gumavub.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/83031187393.pdfIn PDF document text
    • https://tpk-m.ru/files/file/mobamirejepu.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/70165491958.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b241a4466---96206225781.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/upfii9pombio2a7ojv3qj1go35/baxapapuxozev.pdfIn PDF document text
    • http://biatlonbreza.sk/editorfiles/files/kariwopomexaduraxowuj.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/lagalukawavubimolet.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/kokufarebogim.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 11016 bytes
SHA-256: 40482e989ad1441fe042b936247e8b8b4f1c57a95c11b008d0ec5984428f8e1c
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 19120 bytes
SHA-256: 26903169dac0c0eaa9387ac7b7e1190a0df9d54aa551a81dfee71f73fdf1692b
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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