Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad759cd8e2553657…

MALICIOUS

PDF

91.3 KB Created: 2021-06-25 21:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5169e31972a2f1f196bb507e58fca64c SHA-1: f8751d08f894dfa8d5812907ba55429eb8e9d819 SHA-256: ad759cd8e2553657fe71cc8f64a828292b1d66af2b7ca0f9afd6e09b5f1c3a54
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple links pointing to compromised WordPress upload directories suggests the document is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/01t55pht1dq92jgjluud043g84/65730333011.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/34da3f6bfcfd0f2eece658c23eadfe55/gorejerukuju.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a070ebcba40---74690533228.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a027f9b32a1---18369183435.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080648ab2b64---77981317652.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f9f1a1f331f54215d91c65bcc661a4ab/majapobiwilakopidenana.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7eab287b1f57ecb580ab8e928676bf6f/zavitadakuwitopitinolidas.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e4af1c4e9e10bf445082de6ac3f05dd0/pirivepapoxemunozigige.pdf
    • https://jxloanchien.com/style/postimage/file/xixuzajipivakoxezifel.pdf
    • http://geoplan.su/userfiles/file/dogelawux.pdf
    • http://shipagents.nl/uploadfiles/file/5196044110.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b2f7a3961e4b3c9cf7776bebc99420e8/169109520.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/37417797864.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1bcc757c9f2f4fd63a89b3a3139b0ac8/suwudejivafabadola.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qkj2a356jlcb4j42jvvgn715vm/52520349292.pdf
    • https://angkalaris.com/contents//files/gejofakewojewaredorevuf.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/32054659725.pdf
    • https://chaplains-camps.org/upload_picture/file/luxunuvobaburoberujumuj.pdf
    • https://airbays.com/userfiles/file/jomazupezusurezanorud.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210503043036039038j5xln1.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/385e36jmf8qu7hq9ra3hk90iug/naxesirugolizotodexi.pdf
    • https://citytrafik.nu/images/file/12009046871.pdf
    • http://www.contectrade.hu/fckfiles/file/timotulixikubapiter.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=appa+custodial+staffing+guidelines+pdf
    • 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_off0000ffc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 16792 bytes
font_01_sfnt_off000117d6.bin
4c672566619d3a29c6ad91e3a44b483a0a05723e4fabc30402c5ad7399ef9a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 17876 bytes
font_02_sfnt_off00014715.bin
c1166b1bfe1dea3f65f8fa5c75f9d5f6016948d244a16a59114539ded1ffeade
pdf-font-stream PDF embedded font (sfnt) at offset 0x14715 10776 bytes