Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e54b35b63e733e7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 04:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c6383a000e99502fa1e727145b8b3be SHA-1: 43e6580556900d6dabd948c229c07ac8efe59f22 SHA-256: 7e54b35b63e733e7a4d97e40183f589d1c78ed2939553716b9061824a2869c1c
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

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://zhizhencn.com/filespath/files/20210917112555.pdf In PDF document text
    • http://remont-etalon.ru/upload/files/46693995238.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/44560686860.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/wigemesun.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/76791067639.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/furufatasur.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/vukadefasimejitufevegozel.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/85477685425.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/37547519023.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/97939036168.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1edc738ddd547449287012648bf8ac0d/wusizixawozovukomapo.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/6943746717.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8207ad942---25841061036.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/sirobenexowoxamanugejedav.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147e8b310165---xewuxesebuzonopo.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109100006208723.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/vamusatujuf.pdfIn PDF document text
    • http://seamacros.com/upload/file/povizesuwajapiperig.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2991d98c---kexinaxevefovofe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146d8cf8bd70---42837817760.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/pakorojixofoveferupop.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/relotopivubedod.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/80745074795.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/16913480393.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/68018995015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+back+to+the+future+2+onlinePDF 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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 10712 bytes
SHA-256: f5a50b9fc1af1111f8ad39823ec413531961ac00e4f66f1be69076bd4d342077
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 18536 bytes
SHA-256: 0a0f68a40fcf61be6f4ef9c5ac73c2994244a3087ab7ec2ca893871468c3f97c
font_02_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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