Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b110aeb40ef6eff…

MALICIOUS

PDF

86.6 KB Created: 2021-08-06 21:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d3515bb83941ea7dbf6a786e5c506585 SHA-1: 0897c52be4eef1b55275b92275678bf012a22ce1 SHA-256: 1b110aeb40ef6efff584e7aca18114c53691e1cfadd5c064e40efa76de9e0ab5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0ca9cb8240d683bcb5b0bde52147659e/tagejojugurovudapoxaf.pdf In PDF document text
    • http://ahchala.com/img/file/36705824331.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210530120005.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/74757699363.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/38764220699.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/4769541145.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508192424354019.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/wikuninimutogoxi.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/zosonutezi.pdfIn PDF document text
    • https://eurocomm-italia.com/file/romunudemaj.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/dofemovidodiso.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/bexemifajisovoxomadinavul.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/70817127262.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/95473519986.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd621ecdc---dukusufilimefufoz.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160879d5186eaf---11553354353.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2242bfec147fa4cfd1368fd7aaaf31fc/24604862128.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0c6aba0729eb22f66f77383e38baea52/50841173382.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mtr5ar424fuolvcuuv8calm86k/71967611508.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/770kb8sv7gr6pqncp29pbut713/ladugo.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/42918481369.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a430bd24d1e---74994965308.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/renigadilozeja.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967d89a710a---zufetafivegalobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=one+punch+man+challenge+dietaPDF 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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 10700 bytes
SHA-256: 5c4090c4b7ea6ecb76c4cd0de2d13b277dc64ac363afd6f0170d0baed7462580
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 17208 bytes
SHA-256: 3aa9fc2a7b8064af6b3ec658fcf18177d9df2b0e98e65da0e2a0d3763a42014b
font_02_sfnt_off0001340f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1