Malicious PDF — malware analysis report

Static analysis result for SHA-256 8131147a8972b1d5…

MALICIOUS

PDF

84.1 KB Created: 2021-08-12 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db472b4c372eff4924b982755639f623 SHA-1: 4feae8f66104027fdcf692a4387b71c908d1d72c SHA-256: 8131147a8972b1d52802b86bc75ea5969cb69f30db05dba8de9f551cc77d4b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather for programmatic exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sloplast.com/userfiles/files/jumudutotiwekakob.pdf In PDF document text
    • http://quadocdao.vn/uploads/files/11023406012.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/nakemumuzekojixuwesipamek.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/gemerajegonipogesa.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8n555n4efursefn6vb4alua675/65153477703.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/90673462180.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd26b7b4ed8---febogoralolekubopunuvoro.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/41d47a8b74c5ab52545add81d55067f1/feboxosoneka.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c0e893239b7b7ecf9ab8512f2941b8e0/pijajoxabukob.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/xomowanawomufivowaxa.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/tarinamanuxop.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/43172497886.pdfIn PDF document text
    • https://aaaxxion.info/images/file/tawataxikuridumuginikovig.pdfIn PDF document text
    • https://penzion-palice.cz/content/7979214893.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071afe47297e---girarufez.pdfIn PDF document text
    • http://djapm.com/userfiles/file/puxekulorafo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/28713721121.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/lulumunuwibosip.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210730_E1185790C2483925.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210618014249.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/nepofi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/eqc58do7puho7n38te8sm2hm4q/pevibukitirujerenopej.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bea6f7cfdfe9fbd9fc7f6fd0ec1b9b07/dobetaresufowusukige.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/43637833171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+name+of+the+god+of+darknessPDF 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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 10840 bytes
SHA-256: bafa535700f9ea0195cb42ac429a26cb5c194a2925ecd91117de3bb8c23beb1e
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 17344 bytes
SHA-256: f4da0b173e0bd389118375c9e3981ffd931aad3457e0acaf627ef9086389b362

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