Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cbfec0631badfd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 23:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cacbc310e2cbd3f8a0c5bde91bbb955f SHA-1: a2daffb80dcb254ba564f980347ea8ffeea55452 SHA-256: 62cbfec0631badfd602e044e8dd23a811bc1f78d9f4a6c7b09042b2bc65ac8b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9ea873f2---wisejakog.pdf In PDF document text
    • https://inverpalmas.com/aym_image/files/11080618178.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/manun.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/b04uec2m4l0nqp7sdngeio4i01/47485928902.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/tiwituviguzodisog.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/b62mn8kqva7frm6kupc9amroru/toxegiberodox.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/69492049081.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f54962b3---ferusobusazobonugov.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/60915316860.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-6/20210806024732915886.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/3cmbkdve0frqsbkbnedqhb99u5/wezerajuzawitepa.pdfIn PDF document text
    • https://activepymes.com/pub/file/37172945242.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/kijaxanoxarovata.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/varopuvegor.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/43e47028c4e1673b00051cda87cbe120/zupezikosar.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nezoxobo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607264772587b---satisop.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/35420035304.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608050dd98458---30564118712.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/2795048174.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xapawirukeburititox.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zokebolevixat.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/lebotodudazuxopuganarepab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sed+command+in+unix+tutorial+pdfPDF 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_off0000bbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBD 18388 bytes
SHA-256: f42b6a59eca35d32ed8f6fdb5a90e1df9dfc4fc2fcca2610a19ff98deeef6540
font_01_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 10892 bytes
SHA-256: 0b19ee9964bdd6b15de70b27d866e2332a6ba0ea73eff0998e81e6fe355ceeec
font_02_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1