Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e21f962691440fc…

MALICIOUS

PDF

115.2 KB Created: 2021-09-02 02:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14038d2682f0297ab990b37dd4486b81 SHA-1: cc08016c28d315346b9f6b72c5a063492f5c89ac SHA-256: 2e21f962691440fcc1cbeccf0f719c999692a8cd82243cdc396bd5c2719f7df6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://abpaluso.com/upload/file/47390786300.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j8t3c0k6tta1k5bj9fh9ale3d4/bikajonu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4608b274---naxuwagaj.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fe4e6b2d---muzudalubuzipodalubusar.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/68622030705.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/lulavekimobi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/dijoja.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9i3ghbs6rjh3skbj9pufphqvl6/nefexuvalunetari.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/xofimisodogomusumufadiked.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jiginufiwog.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/frfk8o0mvfjngiqq67gc7tuet1/60840328448.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nakokikuzizawilaxexe.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/2382191220.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af785283624---44972265383.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ci6rrc5u5ueb8p9h83loov6135/jijafupanifevotevilot.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965bc5f37ee---13442017342.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/rejebagotu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cef3b0aee37---rojarimamokovu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/98882488977.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jisuzijewamigefugul.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/957e676d17032a526d9227b0a7af9628/19923919580.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852f09548d8---nijezenuxa.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/48056f7c05ce08078e9d4885f5d320de/88939935126.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/18084016499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=thermal+coal+producersPDF 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_off00015c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000174a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 10548 bytes
SHA-256: 5af90759e176989dcca14a4460b32093624e46a1525e80e0cdf45c82da5732ed
font_02_sfnt_off00018caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CAF 18976 bytes
SHA-256: 6a6a668a439239a91af490b9b39bf59ffd9b28a2f14b185a0392e57e31244222

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