Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a047ed52da8761…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 19:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be90ef992ccc989354716ede482c64c0 SHA-1: 0344ad8614b4743ed64317d38ce5090295190160 SHA-256: 70a047ed52da87610f7f73748758f0ac8c1e4fddca27ee0553670ffaeed9a871
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely 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 0.9951

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://cructi.ru/uplcv?utm_term=minecraft+apk+android+mod PDF link annotation
    • http://e-hematologica.com/users/file/wanoxaluzave.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/mafiwufaji.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/megefadoxogo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614034a4a0833---49820504483.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/putuk.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/61459046523.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/64118435523.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/95604682923.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/69257229065.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92df06101---4665033773.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/wafibowarunokobazuzudo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149a1334a542---nagasexiwababijedogosa.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/jabupoxeba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc25b5a883---papisusizig.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/movidowavi.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/44370893128.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/wefopilajomilevavofon.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/linaba.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/33243144181.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/84458477920.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/db94a1b963bd14739ff50cb320c41540/5944009462.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc689703f5---13814844036.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/veledutaba.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109060921315742.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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 10652 bytes
SHA-256: 312df913297b0b01ba86c6fbdebaed46885a77cfbef6ece1d14b0fc208dc1596
font_01_sfnt_off0000cc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 16900 bytes
SHA-256: b72b6e619ffc74284e238a9cf5d84b7055f97d4b89e006200446e595e726b0b4
font_02_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1