Malicious PDF — malware analysis report

Static analysis result for SHA-256 350aa257d5335ec8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 19:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62208c9345ed24653aadcfcc068536db SHA-1: e894a4cf03292677d7a6f19817a457930d736898 SHA-256: 350aa257d5335ec8646892f61f42b9edf77c85fc70778e4ff580b08c23880a50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mimpiindah168.com/contents//files/39753865205.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/xepovuxetalitenu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/82775781647.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/22861071238.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee688853c---kokesipaji.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f0e0acc2ddf7302b83dc90ddb0591410/11227117569.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/85146856982.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e4cdd10111d6cb15145d57e9d70b9d18/8933728174.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f866ebfa5---38074309970.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/11111763721.pdfIn PDF document text
    • https://signika.pl/Upload/file/62795528714.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606d587ab8adb---defitimofuvinol.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/40646805093.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/53035374796.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/wesuvoranod.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/p56jaou8ve7aopblpibu0afjj3/95149417049.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/50750397544.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e96d56274---davuf.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f93fd30bfc2---rodujatutopojit.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/84185973936.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/84441406285.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/82619308655.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0558ebf5---fivunetanufivuzeti.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210518162136936946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=celtic+alleluia+satb+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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 18776 bytes
SHA-256: d8698774f188c0e9911e19c5b80a85b518d4c352fdfb06aeb9f3027b6e2a5507
font_01_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 10560 bytes
SHA-256: 323b755173c95540c12dc3799069bd809c1e16c2632508b772db9ae9503d1718