Malicious PDF — malware analysis report

Static analysis result for SHA-256 d124b3dfeb3ae362…

MALICIOUS

PDF

109.9 KB Created: 2021-06-29 10:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4449181e27a670315c395582671ab87d SHA-1: 62114d5caf8eb0fc2ea883d5b738e31fe6060637 SHA-256: d124b3dfeb3ae3625b9c8725e9ba372ddb8f1940cd39dcc7e311f50424d338d6
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://paroissedementon.fr/upload/files/85320448140.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160909662c8933---30395892801.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae5f5bb3f---67389468082.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d723d14d---82615696759.pdf
    • https://stijsr.com/userfiles/file/gutetexoradarakodakisi.pdf
    • https://mabuksusu.com/contents//files/11385931682.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e9c7c94f5f9de89843dad9fc4edda83d/jemexipag.pdf
    • http://petukmahaaaraj.com/userfiles/file/28322332423.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/29804390000.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8f2ec04e3d5afc21571bca7c84db275b/39007236772.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079807a7921b---mesofimulisixunimasat.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806bfbc96b4---nerepuvipode.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450adbf5---rexozuxesuzewalixujawajag.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/594sbueaeu3ojv2ktgd0kfo5kj/bomed.pdf
    • http://kistours.hu/userfiles/file/vinidanujulifesuxulekuk.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b595e0374e---68633871048.pdf
    • http://orderleesushi.com/uploads/files/lavalafefatebasomejalifit.pdf
    • http://altinellerinsaat.net/UserFiles/file/tafowelowexujo.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/999dbbc6e305149888bce4ea8dd7c453/merudawewozaruzilodoseji.pdf
    • http://agroanaliz.by/upload/editor/files/15826732202.pdf
    • http://snsi.jp/image/news_file/77559293837.pdf
    • https://fablab808.com/nbloom/fckuploads/file/65307081757.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlu3h268a23964p6lh7lia0nij/zexofoxananivomojavo.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/36999852601.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=other+names+for+grandpa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 16792 bytes
font_01_sfnt_off0001409d.bin
5f585b20c80a06ca10460f455d7d6bf3a4dbb20397b4472c4dad232abf994d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x1409D 9748 bytes
font_02_sfnt_off00016048.bin
bb9a3fc69e852293f25ca760a001032871670b85875735bce140535187845549
pdf-font-stream PDF embedded font (sfnt) at offset 0x16048 19280 bytes
font_03_sfnt_off00019177.bin
34335b256bcd75083b9b82844aee6251bb9cb4690253810b75cc9aa512c6eaf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x19177 10832 bytes