Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a552b7b71d03ef…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 15:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 448bd8b8ac3fda73bf50c5435aa1827a SHA-1: cfa333e94cf7e7346cd1c87979708ba7705c91a5 SHA-256: 58a552b7b71d03ef1d22018cfd4fe76fb2412ea6117945b32d0c37c41e2ca318
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs form a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd846ca6224---78492382368.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021511322413076.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/41148606011.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/7561155287.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vasitinemopibagulumesonon.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/pozurasanaredifelipa.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5f9ac83dfd7253dedfd38bf36317dd06/17072005412.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9vskiih542tksi7ubkn2hcjok6/54713092842.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/selisulabevevepisiwofide.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/32479423071.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/44611506176.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5c49ae2b---lumemub.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210719143713_650973886.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/73197959768.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/voriduj.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc28ff0b262---94915073633.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/bafiwadagopifozaje.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b623f7edf44---wapijoxekuborazaninavelid.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/ruwolakibanovobolu.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/91156881081.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/90930993574.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/up7tljlr0qedocsarj1p349a7m/voside.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc7a12ea5---juduriratojenel.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/86756142173.pdfIn PDF document text
    • https://mollis.rs//files/14548768054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=save+as+you+spendPDF 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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 10404 bytes
SHA-256: 5715194d6573590007d40eb4a32b584ad0fdf05a17c9a34547ea6cef2d1acc7a
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 17224 bytes
SHA-256: c4f5f6797715002f2b59de9eff0ab02a0a098dbd863c7d1adefe1f28a3de916f

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