Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c0f2e9a57b73a9…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 03:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c715b7ecd7ee5e15f349e87865d6e338 SHA-1: 4c9f8eccb9b02253c30565e0416aae977be10b84 SHA-256: e1c0f2e9a57b73a9901e2070620c9c85e5e19db73f526392d7cd226443aa1001
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious content or download further payloads. The presence of a link farm on compromised infrastructure suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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.
  • 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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f123afe721e---gidoxexakijuboxonefasekeg.pdf
    • http://daieimotors.com/js/upload/files/30365350460.pdf
    • http://waelfawzy.com/userfiles/file/75417204062.pdf
    • http://www.mostenpo.jp/userfiles/files/gogetarujirifefifa.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/77b671ea4a9b42411a8ec86a1f009095/70001821253.pdf
    • https://angkortaxiservice.com/userfiles/file/kuburinizejijimatoguloz.pdf
    • http://lawrence-spruill.com/clients/42275/File/55054749267.pdf
    • http://bilmatbasim.com/userfiles/file/17644057983.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/liporuloposowelefotas.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b70db83f---fuwosejimumafopum.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa92655c77e---kawewumewel.pdf
    • https://cakkue.com/contents//files/63037529526.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3537c408a65fc99f21fa4bbf5d60859f/63919513913.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac063fb23825ebbbe8710cf5524e0472/mikijarekifudevusovadirid.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9f9c5889---naxinijekopopu.pdf
    • https://vgi-vn.vn/app/webroot/img/files/noxobuwileroxixamasele.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b3643390bb076dd28847fa5e5a74661c/xaxilafisukagamadeguxa.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/248352c63585db722e82597a0e40f627/sezalutoxurigutufow.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc6d2ea3f---13513381247.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdf8ec5e8---29567957524.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/97c987da07365e107ecfb64650976383/36185915963.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=qt+multithreading+example
    • 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_off0000f10e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 16792 bytes
font_01_sfnt_off00010920.bin
cc392b1c2c2b785d0c66cb747a699dee66e48b6f2b6c1ec31a87a7c10a739fe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 17360 bytes
font_02_sfnt_off000136da.bin
2b82a675bd4151176c99f618c5d5b07bd26a50b26c0bab94f6ca01c73a46c993
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DA 10812 bytes