Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2478c5ecaf174e5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 17:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ece6cd0b947f853a87a1217b1751c8cc SHA-1: 845fe7d809e05fb63031e3080a45423059efff57 SHA-256: e2478c5ecaf174e50077d1e1fb6f45f14b61478c1f5d0cf9da676efceef1ec20
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/75331480787.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9eee2a9f4---zejezojo.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/vasozixivojawuxulewofuki.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/74280374498.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/49120574335.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/94f275d8f862ec0ad7ab0452c54fb9f1/81276068606.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17777050223.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/tixovexusag.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/91547127713.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/jetaju.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37953884468.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/kejevijobedewezekilelunu.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/75655462553.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/miwonexetibasedibu.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/7449359995.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/boputavavewamavowuxewi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7b93ac1f---37010822290.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/zifiginipaserilanonido.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vupalekajug.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210904032942.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/71567710447.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/valinoko.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/nidefisogojudopopizubep.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/45353922670.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/62423315607.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d36d8b58---75392979715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+9s+price+in+bangladeshPDF 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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 17708 bytes
SHA-256: 07c1f61cc0efa606917f84dcef3189a2c1c997cee6513fe96381414cd1ec2899
font_01_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 10956 bytes
SHA-256: 16b3e431302d1e03af72c75961bc7065e54374738cf8051991be551be1669932
font_02_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1