Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37d1e3e657da95b…

MALICIOUS

PDF

91.0 KB Created: 2021-08-15 12:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4335bfc1944b1cca571117ea711fd519 SHA-1: 54dc9711fcd4e6c3a2d987a4726e26b467adeb3e SHA-256: d37d1e3e657da95b8379e904f11e4e1c9da59e5affd765a1cc1f5a781468cd54
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://tractorpulling-emmeloord.nl/upload/file/97957762939.pdf
    • http://angarakshaksecurity.com/userfiles/file/jalufefidanisafodumipesa.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/47392a82e9e4d7b17798a5adf6e3e1d7/11195937581.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/73045134741.pdf
    • http://phrabat.net/UserFiles/File/viboduvozitepexom.pdf
    • http://whuntex.ru/userfiles/file/xenapoluduju.pdf
    • https://computerzone.pk/file/vokonozumijunawopekikag.pdf
    • http://bpabv.nl/uploadfiles/file/89304734854.pdf
    • https://aartipalette.com/userfiles/file/tizasojekotexirimesixuros.pdf
    • https://lexconsulting.ro/webroot/files/media/73699969126.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/452nof4d5jk9kfbdh53i77rgn5/61547169570.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/360qr5g2pi8s1khuijmn5r3bj5/19690703693.pdf
    • http://timesofbangla.com/uploads/files/31685726790.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/71ns06dvipiobj5kb59mvig5q3/zisunorigezulefosir.pdf
    • https://reparation-mobile.net/userfiles/file/nudifefolelikidizo.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39cbf71b---81356041426.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2344eb98346c337cd4345213b98c15f0/zapegaxovibukopipe.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9o6no1b8qahh5v69m32191kfig/30511686139.pdf
    • http://rauvuonsach.com/images/uploads/files/11409841166.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/71811946944.pdf
    • https://ap-qatar.com/userfiles/files/pumajatoxerolisixim.pdf
    • http://csc0512.com/userfiles/file/20210702083054_6vmhx9.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b682ee22146---sunazetajikepesimixe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beyblade+burst+evolution+episode+18+en+francais
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e319.bin
9a96a14688c79a7850cf1988d1058331bf4f0489368090d8f9e926224a72a7f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 24204 bytes
font_01_sfnt_off00011e1b.bin
63bb7c1ab1367383077159295e0252fae8867360a2a427341e424ec86d6539d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 11348 bytes
font_02_sfnt_off000138d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 16792 bytes
font_03_sfnt_off000150e1.bin
29c5c8a0d9539ecde09be1a5bafc3a3a9b7520e87df82ad784fd4fd633cf0386
pdf-font-stream PDF embedded font (sfnt) at offset 0x150E1 2908 bytes