Malicious PDF — malware analysis report

Static analysis result for SHA-256 b576be56e519c0a4…

MALICIOUS

PDF

77.0 KB Created: 2021-06-30 22:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 586faef970a2805dad026b5109c4bc24 SHA-1: 9b75d2ab263ca37601c9aa4df428698b1e7f588a SHA-256: b576be56e519c0a4cf7eb8524b6387a42dd8886d75a52ebae0f48291273acc1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious payloads. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://haiphongcontest.com/images/files/webigavaxa.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e07bf712eb1741a9aa204cda06988dc4/labigilabemuvus.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5l933o62o8rfuqnfm009vhvg3i/28857390946.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/600805394ed19e44eef2cde1879b7580/62850172850.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4248ff57---dulakilinetaximerazeru.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/naral.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kudabegoluderevuwazusutad.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210624_AC9B20DD65BDD21F.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/17891598938.pdfIn PDF document text
    • https://unosms.us/userfiles/file/34629014189.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/7502ca4d384d1b549a94a8e40a637f34/66200667317.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/021b6c64698795113884b4f1362abe5b/jofusovaduzat.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/zonukajagebisamujebirak.pdfIn PDF document text
    • http://gloria-eurex.com/75124423521.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4e892c832869cf0f68e631b6449b1aff/16119448245.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/gomokugivu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac861f8de---jolunupozu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xokaxazapojome.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16083c38d01519---pevisawademokomuwamanemes.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160962b7e623cf---44917288881.pdfIn PDF document text
    • http://guowangcable.com/d/files/kekawakefajopin.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/rudevodigupujaxegazuxotez.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/16183107680.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/tanonebusixorakidu.pdfIn PDF document text
    • https://ksboutlet.com/file/files/tisaropulad.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/venewab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=financial+management+book+pdf+for+bbaPDF 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_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 16924 bytes
SHA-256: 6867f1cefe3afb328a70cce1748c772edc8fc8ad1528d50d1f0af6d4e6b959fe
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 11004 bytes
SHA-256: 43df84cb1d9a93a283d5af012ebc345ab51ec838ea36dd43ae39093dd6c95fbe

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