Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a59733149deb664…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 17:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 899d893e158b23afa4d1bc73ed9e980f SHA-1: ecec246cb986d2188ade5d7bcec5cd0391efde90 SHA-256: 9a59733149deb664eed6c5c71b03ee92a23673fe7b1c2be2eea0b0f23ce10c56
156 Risk Score

Malware Insights

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

The PDF document contains a link farm that directs users to various websites, some hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aostavet.it/userfiles/files/17704864159.pdf
    • http://msiutilities.biz/documents/70581581920.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0691ceb4---50630568944.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/61b8176540d89f443c26e2f369103b1b/1615286457.pdf
    • http://asustainable.com/global/file/54500527528.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160838ce4e7b01---54918424902.pdf
    • http://vienhung.com/webroot/img/files/41414768771.pdf
    • http://lyshiying.com/d/files/40553001702.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rpq0jmp04l83nnsdcc73sigic4/vapakoloxigug.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4e121954718990bd6b5d59b15d2b0ea9/55102545773.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb177b30efe---witire.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uda1ufvhqfo15u018iri29n508/51589858149.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a7fb74c1a3e092d0e0a42eb5d099cfb2/4834234663.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e5c9d840---zogimajonalamodemasepeva.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ed697361---86800308227.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/82bd56b5efadf7c6bac3e6c4909bf6a5/sugaviludajibogaj.pdf
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/fujof.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ff6c19ffa529fd6d11e666902ab514d9/xilowawikajituvidavewukid.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/pepilatizanobo.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6db9d6a7---towaz.pdf
    • http://hoangnamjsc.com/upload/files/59871492280.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160713523521c8---sikeguzuzerujozixelo.pdf
    • http://hiro-seiko.com/upload/files/25562377330.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/61d21c1c860b7bef46e4c1c5037ad4a8/wefafas.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1ccb1df8---49657299425.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+turn+on+keypad+light+in+laptop
    • 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_off0000f511.bin
34a7953f68e1e0d38bcdc6a5d92be7fca4ccecb62fe54e547b92584a8c84be51
pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 17280 bytes
font_01_sfnt_off00012261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 16792 bytes
font_02_sfnt_off00013a78.bin
05be7de87423bebee449b795863f49f581217893474dcbacf1f4af2b078e9186
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A78 10884 bytes