Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25b73b9eb07e808…

MALICIOUS

PDF

80.0 KB Created: 2021-08-29 14:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57093fb71764571cb5004b24160cae36 SHA-1: f29488a2cc9dce4161a4ff38583ec165d2da8346 SHA-256: c25b73b9eb07e808083e7cedac8d17d2034762e533f2497397bc8384706e9550
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. This behavior is characteristic of phishing or malware distribution campaigns, where users are lured to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://miaousland.fr/ckfinder/userfiles/files/vuresulawogitupedafetu.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9e65f01817d35b91b02b58bec22a3b55/5814615897.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca70adc1f---88947495809.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34ef97d352f4e90edbb55b6005861eb3/84879528737.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5283dabc3---kanik.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f10418d25---kazobilakarewanizixosem.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1d454896dffdd8eca9db73399fa577c3/70303323145.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3ae33d745f54f8edc864a7a47668729f/75577532222.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/12067368474.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///84019488173.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b09006589919e13ab2670660bc1f782e/1307458805.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/mawigumaxamezogewefu.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/48174769425.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/rolefenexesig.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/6qjkmmtdjt7tctclmuhv7be8q7/67066387685.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/3663520314.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160741df62e4be---mosovofasuzojonukiv.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/vufinoraziweserido.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7aef5f325---9587770552.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/4173179215.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/79716045540.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/noborotesejuta.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/40884447225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spinal+cord+dorsal+and+ventral+rootsPDF 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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10648 bytes
SHA-256: ab419b910fba359f2d777a16c712d99b2bfd79a3c93b35d62fbcb2f48e0de728
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 16524 bytes
SHA-256: 36a88a50342a89ddded9e4406566c202fbd2eab0d540404783066acf58355f1d
font_02_sfnt_off000118bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1