Malicious PDF — malware analysis report

Static analysis result for SHA-256 f022f4c9ea7bbb86…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 09:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b2098002ce2e177be58855c0955851d SHA-1: 9c7d8788df93277d03a9bb5a510d7181cf6f19c4 SHA-256: f022f4c9ea7bbb86f70c70959ce68ab136b442e5816087786dd3be0a404f400a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://akproauto.net/nbloom/fckuploads/file/69275087811.pdf In PDF document text
    • http://inarchengineering.it/userfiles/files/82253811345.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/fofusojekasurodifavijig.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/35449917058.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491e252a19e---tivufolipunowe.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/97083934536.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/89187328383.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6a873254---fonafuzarijuzunus.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/jivavuxuvewa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb608f87d---7679454574.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/viravarexobajine.pdfIn PDF document text
    • http://liily.jp/upload/file/20210909091123.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/lofamifofumemi.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/popobulatuzunitonases.pdfIn PDF document text
    • http://glttek.com/userfiles/file/31376848361.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tidamatemuta.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/muteketenirinaxutatodoro.pdfIn PDF document text
    • http://unseretochter.com/images/file/88560287666.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wosejasimokatan.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/75202021074.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903012326.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441bd6a0a0d---jozisixegigikedu.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/fogirusafed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=top+10+tennis+games+for+androidPDF 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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 16796 bytes
SHA-256: 66ad84a925746fb9639d797305bda4fb0465f4057eaac0a37c6e41ccd0d3d176
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10932 bytes
SHA-256: 3503d1957a639d0c67069b0391e24d6d1b6f92427858488c3940aa19dc188154
font_02_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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