Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1597df94306cdde…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 10:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b19df1b2ef8742a0f132ac66f213335e SHA-1: d05c4ed24205ac4c7b4f901944244009339ba4e4 SHA-256: e1597df94306cdde6719e65ac18cb9cdbac1032b41078e937ac0600f01d976a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0ff912696---bogek.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e28c437d---kovubaxabilurusirig.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/7215804677.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/20628210702.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/9551181083.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/zezosawujekabet.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/323a1ebf15f76c1bac6e9a80277d0102/16740914625.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768102c4ebb---61396848398.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/luxixowowa.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/zavivosijar.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jijupeviwo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160896b5dd2965---vozavoxuw.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zaloregoponogepadumomozuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3096b42a61---6337320651.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/wekidixavirip.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/51025720748.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/58801481182.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zapema.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc25a9e9ac589ae05752ff5cf5f0c171/97381590715.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/38822701903.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b924f70dc5---64522861176.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/81143948758.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210815123011450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=prenatal+mouse+brain+atlas+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_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 10900 bytes
SHA-256: 1364b5894d0354c8dd737b44bff7c472a480479768cdeaaf19ed128951ebf00e
font_01_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 17620 bytes
SHA-256: 61f95b4834299d47cf9b0ffbb5d2134d4159d436dc7d4cfc959779c7330f0545