Malicious PDF — malware analysis report

Static analysis result for SHA-256 897166b62142f1b2…

MALICIOUS

PDF

90.5 KB Created: 2021-07-20 21:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91665a7956436255c11912beed8e88de SHA-1: c269468cf4803f7d0d8dc6315644e0f49835842e SHA-256: 897166b62142f1b2a46422d422b686523d110d4aa32a78828791bacf12df2ee7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f32651c45---fanowesuvuxosemizu.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b445ff2b8072b6f2692e41bf91dd9637/8359326830.pdfIn PDF document text
    • http://zenithmetals.com/files/15535748464.pdfIn PDF document text
    • https://codecs.roimages/file/xapapuvi.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/nutinunapazeril.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc6aa4a19---xukaxif.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a62051848---dajavafemipiwul.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc87cf1f55---wikelowisatofed.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4c05f12290e81ea5f1e857d0757dbce/jesemeriku.pdfIn PDF document text
    • https://actorconseil.com/files/file/46274380203.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/4157028784.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/refukunalatavunutusa.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/83691640633.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be828ec6a25---kusafig.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/fiwaxezalusenikifovop.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e0089a9e---jororusimizeb.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/bijibewabujapukavegijov.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021625415589578.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/94955589151.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c371d274f48---11646286987.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/10250722192.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zejebemozexagunefowikom.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/39c10c880771dbcd06815a677a64005a/56446350653.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4f3bdf62b---36027874430.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c933214e1---vegogene.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/norowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=role+of+planning+commission+in+india+pdfPDF 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_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10812 bytes
SHA-256: 4d8ae15eb465d45417eec7df2ec88ec785d8755da0f27c19b8bb19f391db36dd
font_01_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 16376 bytes
SHA-256: 3440b28a5b3726c8e6533767664ed53a2e25a77bdcf5f03b539bb6df4bfa32cc

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