Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e992effb1432ea3…

MALICIOUS

PDF

91.6 KB Created: 2021-07-20 10:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 847a313b56f6849324c80b8293ae901e SHA-1: d5335601557987500ecf0085cba2f3041ce7e1ee SHA-256: 2e992effb1432ea3359f97f3a1f94d4b2f40d671e6c13f248df56d2a4615b4ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d192ad43f04---15346923535.pdf In PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d6994f2ec15508049b0cfbd1ee6d43b0/fupozep.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9f80b93f---tegagotevilekedof.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/velamusebimuvemelis.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ccbeedcaca3c0779d2597eebf02ba7f6/62373627077.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/95429707279.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/27368390930.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/kunevojopokorulowuxav.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00c9b307d---53640208714.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/nimikomu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/72306351484.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/86493793553.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/wilavema.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/56928080626.pdfIn PDF document text
    • http://erdbau-rauch.at/balapadosa.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/bepuf.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5aslnoplnig9jjjbielssrrdgu/41549956134.pdfIn PDF document text
    • http://philboyd.com/66069442741.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1d39fd3b4e2d45123dbd1a9b468712a0/vafafuxazawusokepi.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/fitakepupuxid.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tnq1oqf5qng56lbspek8kj2mv3/winuzamugixizoxanulimevew.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/be6c545985d92c28fa540e4c62de1215/mivebuvugal.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/79d75a9c0bd9c3382d2388a4efe85d8f/75793902503.pdfIn PDF document text
    • https://webmenuplus.com/images/file/26201215627.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b4e256fc---94396320996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sat+practice+test+5+reading+answersPDF 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_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 10820 bytes
SHA-256: 678586ae858bafff4de8aa1ba1a4f43834a5da7e43b11ddf8889f14d1d24ec3d
font_01_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 17044 bytes
SHA-256: 4ab009e3a7ae7e80008e245f1802cc7711f701772aca38ed5b0d3847196a5ef4

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