Malicious PDF — malware analysis report

Static analysis result for SHA-256 4772c1422dba9971…

MALICIOUS

PDF

89.1 KB Created: 2021-08-24 21:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd315ccf42ccf8e33ce8e7edad16c3ff SHA-1: ffeac9dd79ce5f6b827269b2b8dc50ed3b3a8a17 SHA-256: 4772c1422dba9971b7c0eb82093fa9881815fd246d3f863d4a430b7b365f56cb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d92b3b95---siwuzonudematugene.pdf In PDF document text
    • https://pristineleather.com/userfiles/file/lomojapajokili.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/14735839410.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/ginajameputet.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d92c5896f1e---21005148104.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/38431828907.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/58006178972.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/15801461437.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/065c90cefaf6b105eb6f76bc717c404a/tipaxilowu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608036f282585---9762832949.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/20398634539.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/62903248721.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kokedetalodusejiwepikijax.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/49395635766.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/dofolanekujenusavonariz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/pofasisuxew.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/pebitexesuvegotatuwepojog.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160888b7f7d61c---nawolanopun.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210704_074414.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebba56951a---25065950089.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5aca4e2ad0789adc20386570e97ac8ce/25475489300.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/zilel.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/71385135674.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/157u5rpgud898gkjpd5vh0b6sm/rokudafupu.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/20921203620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mild+hydronephrosis+treatment+at+homePDF 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_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 16496 bytes
SHA-256: 238a59e6f5434b95aa497884edc455f01b72a315a402add58bd43155a367650e
font_01_sfnt_off00012471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 10764 bytes
SHA-256: 4ea5bcfa254789c42207b281f1d0a1153cda6275e9826f728f4811d7c74eb6d5
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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