Malicious PDF — malware analysis report

Static analysis result for SHA-256 938c9468f29c45fb…

MALICIOUS

PDF

86.5 KB Created: 2021-08-26 02:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83399de520571618f235479bbc1fc614 SHA-1: d03dcfb3dd408b52fe570b38759f725095680f3d SHA-256: 938c9468f29c45fb102bc5dc7678c2a34984507e410841c9eb0679575f7c15d6
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain executable scripts, but its primary purpose appears to be facilitating access to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/491f4914b49a404dec2f8e467cdc0dc1/54549113795.pdf
    • http://harasim.cz/uploaded/files/15738052836.pdf
    • https://hondamienbac.vn/userfiles/file/lefat.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4820521b50---gopizozekonijatuxoxo.pdf
    • https://blugarden.eu/file/74859698970.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ns82dlk73lehvnqdqofkpuuc12/42898912215.pdf
    • http://stpatricksreunion.com/clients/84553/File/40822564850.pdf
    • http://terminsk.by/pics/files/99697490725.pdf
    • http://dcbestwings.com/uploads/files/jowujamoxe.pdf
    • https://acronimocostanzo.com/userfiles/file/fapakedowa.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d68c4e7a6b---lidopawabanebakami.pdf
    • https://ceccarbotosani.ro/userfiles/file/dapupesa.pdf
    • http://ave-france.com/pics/files/70324462538.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4e10f94b089fd9e6a938ba0f65ea72c1/tofabew.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fobigigolubuxuf.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tkssih4nll3uv7piotu43uhqb7/3859599150.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfeb2ea4e---51914160214.pdf
    • http://salt17.com/userfiles/files/mobuvujutokajuzida.pdf
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/21886464910.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fs1k1scq17cfd878j6icg01tm8/pozogutikerazuzujo.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeba482699---69842241424.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/marefozekixofoxojez.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/vinemavirob.pdf
    • https://baptistfriends.org/media/zuzopopivivaraponatugo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=old+age+fitness+quotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f033.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16792 bytes
font_01_sfnt_off00010845.bin
9437ccb2cd5ba5470b4ba7caa7b6572090a7e11d36d8da9d362398245142785c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 17196 bytes
font_02_sfnt_off000134b9.bin
3c1c6bd37a7741e842b4d9ad294621eb60e5188eedf59b222c1a8ba80a5a83fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 10700 bytes