Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9569f0de85920d…

MALICIOUS

PDF

108.1 KB Created: 2021-06-24 21:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 03be0e49ed7cdeb41acfeffbc14d5d98 SHA-1: ecf3038506e7c52e8981538846c42b3fa90aa505 SHA-256: be9569f0de85920d2a7b0eabbacdd12065279090e6febe3e8448131665bd1d7d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host further PDF files. These links are likely used to redirect victims to phishing pages or download further malware. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=shia+namaz+pdf+in+english PDF link annotation
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/mts78ceuqm1uscl9b1b7hicne5/34821496861.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c2405b6dc8e08175333985e68ff1fff7/teturoripofit.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076241e71ba0---6966098477.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d972d30de---wipizidulirugazul.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e5ba8a4eb9884bcf33592a468b9090f4/28280945889.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/xenusuvotuma.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b61dc890---96942287110.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e58e9b769911606927597738c7fb3809/suroxumedipipozefaro.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/vapiwaxetobalali.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/18e95351fdaa170eaf71010acce803b3/69764313405.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/62783052969.pdfIn PDF document text
    • http://vejwun.cz/images/lipox.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f251fddbf4bb2a1744cd3d8545e37f40/nimojozig.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/3900905000.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba007639d69---37630914116.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016e4d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16E4D 22064 bytes
SHA-256: 655b4587b75472352d4c4062bcddfe2efce4452f0bd34c1142c403a50ba8cc89
font_00_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 5112 bytes
SHA-256: 44897c97482a1ea1cb7b4231ead568f4626ddbaf49c454f62b60a1e4657ac979
font_01_sfnt_off0001439b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439B 13244 bytes
SHA-256: 3692de6b84965cc5a1689b9ff313d1d85dd3c6d6e782e78424ffdf153b08b63d
font_03_sfnt_off00019551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19551 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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