Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e91081cc8ec41e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 00:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09404a244bf24d5eaed2503de550c1aa SHA-1: b2f1d99d12cd9a0cf79d6917246bc4a27ba7b215 SHA-256: 06e91081cc8ec41ec04fd5d5d0a655ae743aa105a1fd56263a7c788a18b2f171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the heuristic firings suggest the document's primary function is to redirect users to potentially malicious or phishing-related content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3af6c9a77f---pisigogijeti.pdf In PDF document text
    • https://ip-pharma.net/data/files/75507519292.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/16098817911.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0a2587c61---sorowovumefarepuv.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/jofig.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/rarozatovigatixala.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1f02ucdlarhnb84045aad2el28/domatasibolafene.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1fc6888e2781cb8103bca52f206f3199/69516744818.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/25949981397.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g02439g10tlnt7mt6gfff4lt7v/nepuzupakedefulezogipowus.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/73e5347etr5tvj8t5p34d30fb8/12917427305.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/rupupovatawevejutusenu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/19852930474.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/30168712710.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8bq3tnudaf6n273su13q8c5r1r/podesevuzajitesepijupita.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/57624cedc83d418131bff80e85f1ab39/kamifixasamudus.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5b3884eb8373f3cc4d547c852dbef80c/bokixapikalu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/chc32uvhftuiode52tcv9fal51/61887998393.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/zavuvise.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b219f37c22efc379012b75b2d2fca5c3/vimoro.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608013e23e703---57953452682.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/98311077590.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/xidobisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=binomial+distribution+examples+and+solutions+pdfPDF 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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 19484 bytes
SHA-256: 0ab6d843c4149f4fac57a2ebd80cea9b18fe3dc02a5ec53d691df25143cfdb34
font_02_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 11052 bytes
SHA-256: 8233adeb594dc2dcf5a28275d5256f317b26658cf90247b67e2af38120cc4e56

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