Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23c72d2e50e13ff…

MALICIOUS

PDF

113.4 KB Created: 2021-08-21 18:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cfb5dc9be6730a0f00dc48a9a184080 SHA-1: 3d2c88ebede4cd6b7cfaca5c7454881769b1e6c5 SHA-256: b23c72d2e50e13ff24e3fdc6c2be1af36a3e8172a14888d591a53cc81395ce4d
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 or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the primary attack pattern involves luring users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://synerhu.ru/uplcv?utm_term=what+does+preeclampsia+with+severe+features+mean PDF link annotation
    • http://alimentosldm.com/userfiles/file/29071877029.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/jadofubuduzimusekiwaxibeg.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2ba6b3de914dc40b1e34014422140126/55116128250.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428120341174.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/21375475003.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe522e70e---jasinejimesupirus.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210714074230_1xvyxn.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/45236325158.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/rijetububepaparu.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/sefufulowuvorolifokod.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/47903118490.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/ximuvebu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161049c4aa6931---8382708636.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080975fdbe56---mivajapowawiropu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210524/210524225933084411gbnpacurrjkd.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0f2c1bae---77952640124.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g8mfauel2s7aifrvsedaeuh725/16892370770.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/78685469616.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/xelutetilemunivafigamab.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/46937140578.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/43712558630.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/99704638964.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086655a8f5e8---886899478.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0b38c300---42628393760.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23ca31474---nedolagiresekojemove.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ec6b33b49f7e340a4f3065e0428efa2d/danobofagitenawivef.pdfIn PDF document text
    • https://medlineplus.gov/genetics/condition/preeclampsia/In 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_off0001544b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544B 18920 bytes
SHA-256: 90d1a739f7568be716b0d75fc14545d987f3cbd71106158d0735b778998628b8
font_01_sfnt_off0001858a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1858A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DA1 11128 bytes
SHA-256: 279f1dbeb27f1b929eeca254ba26d4eff87c1b1f410b675abd987cac1d369ec8

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