Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1418a4161d1a65…

MALICIOUS

PDF

86.1 KB Created: 2021-08-17 20:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c67ad89d05be8f0108e1e8b00b4d1d00 SHA-1: 20b17a65dc43980ba3d2282ce567729c01b63172 SHA-256: 7a1418a4161d1a65da411916bce19de8818c7a73fa9ad35e306350e1ed950c1a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=the+secret+life+of+walter+mitty+story+setting PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/444d049768aa842373e3577ddc54fa16/71654222619.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/68251767690.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/68651172863.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/33484597384.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/52944908050.pdfIn PDF document text
    • http://shophouse.info/images/files/tevepavatabijazuxop.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea1876a07---17074412641.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116000b054fa---kixow.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/sevedebizejow.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5e341e3b---firumivekokobokazefe.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/66727d983f0ff05405a1cdb4caab5c66/75500854437.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbe236641f---81456523337.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/72ff9ed704e6f7605540b302d8e31943/podalekogubenej.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/rupebezururobuxiw.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-14/20210614210332473531.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zejogazapidorumamawux.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c0e8393e---xuvufefixunega.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/12046742118.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/95008934709.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061001224973499.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/27507592361.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/edelovilokuboxaverusaso.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/65338186897.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d387370ab1a---lugunimeduges.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16908 bytes
SHA-256: 870c6e2ffc435ad0a9c532375b4a26842510f1aef3b2b26c8d76b32637f5ec4c
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 10944 bytes
SHA-256: 9029a3fc58b4b814400921065157197aa84d248feb6cdd86389bbd3533cde66f

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