Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac9ed072b1d6f00…

MALICIOUS

PDF

78.0 KB Created: 2021-07-21 09:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 195297009b23c3d4237c96b2b01f80cb SHA-1: f60db6f6c11d459931f45259408df83d89e4d0cc SHA-256: eac9ed072b1d6f00681eeba077580bbc56e971fcc25957b7c8b44b65bc7f4220
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple PDF link farm indicators suggests a deliberate attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b152f0316838850e0417143a2232fb23/todatukezogisatoxenawexen.pdf In PDF document text
    • http://chingyi.tw/userfiles/files/dorozutamexevelu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6d87b4dd---kakaxezibawebupiruxerol.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084520f5c8df---faparunabov.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/24772896722.pdfIn PDF document text
    • https://sambelteri.com/contents//files/26527273366.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a27a0a0b8---zibip.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/porotekavoso.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c710e80d90ea0e99865d6470ccd0d6b7/tofawulemovilalotoviroza.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/jumujezugosu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9ccd1e0a3b7bf3afff8aa38806eb74c9/tororejoposuxipem.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/navajabifuguwizowidu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1685285f3c65ae41006d460692f951f6/terobutakorodovow.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbafa700e7---50920937500.pdfIn PDF document text
    • https://datajournonepal.org/files/pukojevavosegufizisa.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e79e3f83ac27407d619c27d3474429be/javedilisonewogowofa.pdfIn PDF document text
    • http://otczenacts.com/media/files/6746023343.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c998e442a84---39694268403.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c78265fc8---jotapetolepam.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/vofukuzitosabekitonikowo.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/dunesujofomabugumigurupez.pdfIn PDF document text
    • https://anfauglir.com/images/file/99723425124.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5v24nabe0hljf4opb69lc82tnq/49787438647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=been+up+toPDF link annotation
    • 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_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 17952 bytes
SHA-256: 18040635cd0e3c2e591b8afd8d9d1e3c4d1aa60203453d11498c8f6b8d309f05
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 9828 bytes
SHA-256: 72188b80b99c3a0235ea7744fb91eb7035e2a060fb1f4efac205c151d9c90d0c

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