Malicious PDF — malware analysis report

Static analysis result for SHA-256 108c7e164b52e380…

MALICIOUS

PDF

102.2 KB Created: 2021-07-24 11:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 411629403113ee066ece07a2ef225874 SHA-1: f5e56ce8803a19cacb633965bb8bfb67bd784f58 SHA-256: 108c7e164b52e3809bc1377b9ce7c6dae43ffe65350f84f90c2a5d5a2711356e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of a link farm on compromised infrastructure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b273d9594a1---jemadegubuxarifere.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18d68ddf30---34119679981.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3dd735de2d---35530679898.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608800b7319af---36082789395.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/30700749065.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b197600b912f3aa4bc60f05862a115c8/96404560319.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5bf7fa9f---90021712066.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jpo4rsvvasob0dl7hauuh9i795/69626838871.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0cf148a34f11ac829f0807fa2a29a274/tunagepizugikux.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wubileteripevexawebifukof.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///35675013513.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3gos6srvm6roqoe401e4c2k43t/20694284473.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/tetubomijevedazip.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/18397141801.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/74908697759.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/xunosivir.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/72017771162.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105181054.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cd93273bb8f0fde2da2fce78ec342b32/lawamupekoluleburaso.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdokmdelhl2s1h9sokfbdndn83/47359942606.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///mitelurezimuxalute.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/texisagagelokifik.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c50aeb3d342---12040535781.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fa4c956cb914c8996da20065698f388/bodifaleviwitatusiro.pdfIn PDF document text
    • http://unsersohn.ch/images/file/99982175167.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c84u7npf89h38v1bb52880cqf5/jalovebanewokijem.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1b1f1f02d1f53ffd141e696d9ad2cd74/jatatiwububimixuxovufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=why+was+jane+foster+not+in+thor+ragnarokPDF 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_off00012ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B6 17356 bytes
SHA-256: 3d66d483a40ac1ff70ae58297a47d9be190cb8cfeea18e0a26e42a767ab8f5f3
font_02_sfnt_off00017148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17148 10864 bytes
SHA-256: 4008631f3d915dd66290a1de28a43cc5f634190d74ca7530c1c135af36248f40

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