Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1a7eab7e9068c3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 09:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39f58aaa8e5ee85c0614e42ec335231b SHA-1: 67d8d531d10ef7cbdd0ca993e1136a37b04a3e72 SHA-256: bd1a7eab7e9068c3fa5edcdc918de4af797bc4831832222ab15d2125be13324d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://infrive.ru/uplcv?utm_term=james+kerr+legacy+pdf PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16132c29420d66---16265098539.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/visosugomoxanuvezi.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/bowumavawezunuw.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/jegirodedorukavi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7q72gj0h9ue1p07cjf2avhg715/pomakamerupatuwo.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/kigidefapuvifelipo.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/zoroxatebukoxujum.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/gavudekaxokusidaxar.pdfIn PDF document text
    • http://ymmicro.com/files/files/kefiranupizizofokipofi.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/wipatuxepedegador.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210905_7AC3C44524BAD507.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c2645d8eae1ea4ed9b7f5b9d3f37329/zujonazevinug.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc9ea2242---2597909064.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/9621050928.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/11577263132.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/82794660197.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/vavazufafirebixosokumor.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/gexotunofasugilakige.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/lojunato.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fosozitif.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/21726736359.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/dorimumafekasajepe.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/59237579420.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/98027835141.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/xovivana.pdfIn PDF document text
    • https://partetesal.ir/data/file/45421269464.pdfIn PDF document text
    • http://steinemann-ag.ru/faruviviretefiliduluv.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_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 10748 bytes
SHA-256: a79fece9a2eb8c4f34b2264d536b0f4400429fdab33d70bea150357358a35cc7
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 19348 bytes
SHA-256: 03cacaa2ab0051cfc07f2dde70ee1c19cab1c87f8f4e17eee6fcf013e01193d3

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