Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0932b7673ee7748…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 14:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0d4bbb3fd37b193270d2d5908887e8ab SHA-1: 472f3ecd86a4ff6caeab7b19dbaa482747a487d1 SHA-256: c0932b7673ee77487a5f203d360827a6a9ec6702da64593d20f72e42235e2f00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators points towards the document's primary function being to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=jojo+moyes+the+last+letter+from+your+lover+pdf PDF link annotation
    • https://bimstudioinc.com/media/files/soroxoviruvasazagelo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91572318247.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/vumerezixoguduguxugosurex.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/1679098762.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/32733367616.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/75734654078.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/rudakesevukagibilugodanuj.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bdae5d6f---96107630907.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/rabipanuxojosujeli.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/72462679028.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/rakujafipu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613576bc201e4---2508400998.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210906_DB0554FDE4C1C8AE.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210909054818.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/43710601027.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/kurojipedunapivolesur.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/55425947563.pdfIn PDF document text
    • https://soechi.com/userfiles/file/63840387731.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/mumofakemupakadavipopujij.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/foderugavagugegek.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356069d0afd---80656535469.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/mawotadiliwazetafu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd67891590---zavavigetajofagirumib.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/linuxolomizaxegobo.pdfIn PDF document text
    • 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_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 10968 bytes
SHA-256: 768260c9a1f9cf52206d13e959bea3b4db9ef9d1348559324b3a17ae384c7022
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 17532 bytes
SHA-256: 7988d28b9db3956f25b74f20a130c5fc1aed7b7a5841462e715405afb395465f

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