Malicious PDF — malware analysis report

Static analysis result for SHA-256 e571f7c2224977bf…

MALICIOUS

PDF

80.9 KB Created: 2021-06-11 10:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3ca24c03c660896fe0b1f093d123d6b8 SHA-1: 6f0b540f28f7059a56d1aac31e7d3889684aa0ff SHA-256: e571f7c2224977bf040366dccd7a81f4242bdce4f04381a7efa725e2367f704e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://oniceh.ru/uplcv?utm_term=asvab+vocabulary+2020 PDF link annotation
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812223252e2---temos.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/10cc51f72235861c30b7fd79ad08047d/55592697016.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8ed64a5ab821f7a1393136a4b5ed89b2/52308903375.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472359fa01---mejujisafezo.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f3a83dacc53a212c4e5899f2c4d6291a/kimalago.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a324f343e---gufakogasopizalo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e3b0261df0e11e5c7687de84dab137d8/57322923083.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1e7084f84471d08c1fab1c8a30771056/fobap.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fabil.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/kitupotobatu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a318156925a3f41d95fb41ffdf31071e/jebixiwagivizumoruzi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b629c16c749---19006298997.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8b27b80---8106695358.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/26457976055.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3c77d49cbff5e37ac8747c0b99f68ca9/46459798998.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zemul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 4888 bytes
SHA-256: cc815ab38e86ecf402e1ecf7b72e0953571f44c9a16202762c2daaf706e4dbb0
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 11020 bytes
SHA-256: 7702b36443f0fecfaacae4e7f8f70898f8146909ee43640d02557280afa68369
font_02_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176