Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2ceab2e44daed8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-14 22:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 260dd8d11ee5b971a48bd4f51a91400b SHA-1: 241d56b24fc76fb0edaa0aad82d108a369eac602 SHA-256: ef2ceab2e44daed88be5c1fdc4715bb9a87ade26a7128435530783ef2e345fd6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing or malware download sites. The presence of multiple compromised CMS upload links further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://garglob.ru/uplcv?utm_term=tplayer+apk+for+firestick PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d15209653---tafebefozoduvujusetunog.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/50222797102.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109132057317619.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c33b1df94c9280e56522013a3ef3b18b/zixub.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81e607f47---kazedirosofonaxuwune.pdfIn PDF document text
    • http://sns.hu/_user/file/gexanogowotubul.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161355e086bd29---43602477346.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pavozoridulixiruviwifadus.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210901225312683877dcfc3onwizgs.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/34936224580.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/25250706210.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/56140238106.pdfIn PDF document text
    • https://matrixx.lu/images/xurajotevuna.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/vinusuwosil.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/6509481723.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/lowezolu.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/banasulegotawonituluri.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a54d0878---56156114218.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/1401207929.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kalutenuxosodew.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/zawojemofefotavobedebuzu.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/42996591349.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/jazozelasidiv.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/pobosejoxo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0947f87---46243147153.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/baduvasenaxod.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_off0000b848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 15820 bytes
SHA-256: 612f9e0a931e25aeae6145a25672a8cc44c8cd823e69493dba30acc0631a7b5f
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10540 bytes
SHA-256: d12496a2d8061e74a3f9a010b49f038f3962c43b08f3517e28d56a05bd6ef342

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