Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6bd6419b26579b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 11:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 565808f6127bf33fbde5ece5a89283df SHA-1: 8ffc074af719843009aec6d11426315ec95d61ba SHA-256: ab6bd6419b26579b3a073579e0cace27938672ee27d5338fbcdd3a1ff5935df6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://jechrina.gr/FCKeditor/userimages/file/dosozivel.pdf In PDF document text
    • https://fenixfalt.com/userfiles/file/lebibebejepiwunejuwem.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/12071520292.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/624618014.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/88487761148.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/73010166361.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/2323027506.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62eb2ca3e---suvopubevurebapikamige.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zevovedefugaperaritu.pdfIn PDF document text
    • http://rabwork.com/media/file/dokujujidoledexemix.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090916362549.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e94ff0a4b5101b4970d304896acf4767/gejiwujigokojegu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/zuxudunofanopojibudasodaf.pdfIn PDF document text
    • http://timocomputer.cz/files/file/komuka.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/bimurojigapuranotukile.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/1034417241.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/kazisaminekulux.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/tanadikadud.pdfIn PDF document text
    • http://thevalleytrader.com/files/536550251.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/30912316061.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f2a88920---68841524270.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/6171928909.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/subajuxewapiriniserit.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5b874f57---fivimoxoduwinezesexagow.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tuvuxupumomi.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/nigebevenaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=miss+congeniality+full+movie+eng+subPDF 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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 18136 bytes
SHA-256: 29c625f18f6c4419019a86fd32368e8600aa048abc64bcf2879b647e45446e47
font_01_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 10992 bytes
SHA-256: 4c3daa5450f47f66ddbe795650ebb6c643eac3e7196b84689cbaeb207aa606a8
font_02_sfnt_off00012c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1