Malicious PDF — malware analysis report

Static analysis result for SHA-256 82364fb32eb9a8f2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 05:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: febd7cd07a22d1eb93ed1b93e67cc6e3 SHA-1: 0b38995617460f3f2e94b242502ff179d82b63be SHA-256: 82364fb32eb9a8f25bae365a38ea6f23c627e1c32e99d03c367f57dfade6d41c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fenicia.uy/fenicia.com.uy/uploads/files/21611627629.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d054aed3d5bf32989d9928a8c307aea3/fadeper.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b58c479c---tatenurevumulemado.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/99680153757.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/79eb5da6fa95030cf0d6c754c8b3ae9d/getajafevo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160845530bcb2a---79885561035.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/94484003627.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bk4ca1vv2l2m9op6sn2rm408uh/tuwugajufuru.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/19555862010.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0fb09b429---nogawurixowaxivo.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/si7k25u4k2ab3hb2oecfup05q1/95975369489.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/4597121403.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/jebab.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5523f7a4---24455029495.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/30682040548.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/sibodiwadagewagegemus.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16096966214f23---45024114469.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d060cc4634a---74890880625.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/gituzofupodilefimid.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5258d2e5a54d760fdb0fa23f853597e3/31975983366.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19a33460---78884467694.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/24544991201.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/45812756772.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/duroropolizojamobenuvataf.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cc55fc012c6c593128b060cd19cb11eb/kexusavabezabaxijagu.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/20094836133.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/xivemiliwigude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manual+for+living+by+epictetusPDF 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_off0000b780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB780 14504 bytes
SHA-256: df2cb7a37b131c31f209ed8a8c0d9496ae4fd89e82be6040572866420db181f9
font_01_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 11068 bytes
SHA-256: a068605bc8af5f3d973b6a2be5b5fd30ff1ff2a6bee101964709f806b3c7472f

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