Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4efb1482a1b125…

MALICIOUS

PDF

100.9 KB Created: 2021-09-01 01:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cf8904e6edfc1995e2d7161efb07529 SHA-1: 489ac9700b0658c9d04659926f49ddf64bddaa3a SHA-256: cc4efb1482a1b1253b968fd2a133205c372fdf52475b32ffab35ce604b06d3bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique used to distribute phishing lures or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f6a372be---gixonazafenojododakegos.pdf In PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/40292269962.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b428e5639dd2ae37b4abf12a335008bb/9137765318.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/11478845700.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/kolimajozol.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/fanijofewexasejavomope.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/20876675627.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/kemukuti.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/27004079714.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b8bd278d8f4e1521d9c1d5ad58edea1d/90571164403.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/74148310632.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8b78b8048a714cbf33c413469607d9d3/fulera.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/fd5504f37abfb7c56b8765ba13723a91/denepibuxatofu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a1e8017325633fd3fe62db70b7d45ba4/41668136595.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e389e871b9---36450399022.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d5ac9833a---54182126677.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zirojefavepedobirazep.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/95263598020.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/davixifezurusiwasigo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884be6aef93---kofoluze.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ca9ab87a---76653795839.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/57663746803.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jomej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=learn+dotnet+core+step+by+stepPDF 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_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 10580 bytes
SHA-256: 3705db2243b1a7b8719f2251b573f496af0e13eedc0882125cd70b9a856892f6
font_01_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 20204 bytes
SHA-256: 83edd50da2751b7f8fd653691503abd7fd9034861e4a81d3a4c180bc8a4f3350
font_02_sfnt_off00016d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1