Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c4608d8a41dca2…

MALICIOUS

PDF

91.3 KB Created: 2021-07-08 11:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9e9209998c8c7eee84649498643147d SHA-1: 9ff5d15428257c635096ef3636ea9e21d21eb7fd SHA-256: 03c4608d8a41dca25915a3938783d6f5aca705edb3efa2b493941347b2a2c0dc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites, likely serving as a distribution point for further malicious content or phishing pages. The presence of multiple links to compromised CMS uploads suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a470952a35---milakerokadaxazu.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/661dd964122d91651e27dabc37305ae0/89389906672.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/82566003077.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nc788bb1q65tfj1v6md5i4n8r3/binajibur.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d85238a9b---46317945668.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a4aaa4396---jonibokisuwuzanudaxetud.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/95550663327.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/79436871728.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d663a61adfe---nomuto.pdfIn PDF document text
    • http://charivne.info/images/file/zolikibafazab.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/kumobuv.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283c193bd5---94532834347.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/832da71a4124f829e0ee3f737965a167/12084667879.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/9611094138.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb87206d10---zolixebufilawiwif.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/be63d7d119af3e06a6ba8629d2a70046/65557774024.pdfIn PDF document text
    • http://3q1p.com/upload/file/210630164628296877nh262kw7afg3.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f6r2mrdm9hcbaip8pgdh1k2lho/93942642397.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a44c4ffe3---54513796703.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/pewivowo.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ddc5f6qk6ga3jvark4j6ac6gto/migerufufadugipogufigi.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/12707027384.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0735347b8322e534e83fe8f3bb9f6932/texotulimokuguretutuvepiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=romeo+and+juliet+act+iv+study+guide+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_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 17092 bytes
SHA-256: b284de9703ddc7991a2632f9d6efbc2cbf4acc6c72ceafe1d7c9ed3850577437
font_01_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 11252 bytes
SHA-256: 3d139405a45392dcfdfece2ea25e05ea76dce734c621a246ba06d91ee69739c6
font_02_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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