Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fef3de165249f8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 21:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21dafe3efaed6370c341e6580f6961bd SHA-1: 3f6b75d1a2247eedf5b4211ba3b0c06ec990bc89 SHA-256: a8fef3de165249f8a3498dcbe4a72ab893bde0ab185e53de9fb2e1b0c1b0cbee
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 compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The file's structure and the nature of the URLs align with techniques used to distribute malicious payloads or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://catamma.ru/uplcv?utm_term=get+current+location+android+programmatically PDF link annotation
    • https://e-ssuances.com/ckfinder/userfiles/files/58002764182.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8b14a5912---12655850017.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/27187845611.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/44899097371.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/kowigi.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/goxiwidowazabugutiduf.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/80687348468.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/somikikuxexa.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/wemijafakaloraj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372e2a2c638---31531937568.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/gunizomewarofi.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/jimepuxigave.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///zowabopokovatoz.pdfIn PDF document text
    • https://tckontrola.hr/files/97118570724.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/76970469059.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/27525183392.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/govabinav.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/10009331598.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/todiriwokidade.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c72ee5fb4---sipapupukom.pdfIn PDF document text
    • http://e-district.org/userfiles/file/wutafetufikidimagibijo.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/66836935008.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/73220450941.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/gedodolijop.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/44695208409.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613716e24f1a0---57524052967.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/kavipimikasifipapef.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/nogoviginarowonarumuxabi.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 10944 bytes
SHA-256: 5b07de886f694101467d067fb661d854e3dc8b1b55335255a71a252ce11c1564
font_02_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 14688 bytes
SHA-256: 20d32776c1955b496001047affd924ca3390d2461a213a9e71f0a7baf31aa05a

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