Malicious PDF — malware analysis report

Static analysis result for SHA-256 4930a0e8ac311f62…

MALICIOUS

PDF

92.4 KB Created: 2021-09-02 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bf9cc67886288507a39e0b098653c58 SHA-1: 83bda4ab13065e1f80c3fb40ae0a068de8d2a22c SHA-256: 4930a0e8ac311f62315c0a8c1ac1a405652bb051c7902a32a5671310d35b0fd1
164 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://dla-pracownika.pl/pliki_user/File/budisesurelukinij.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c005d8c80ae---21964486260.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b47eebf5---telanuzejadaneralesokalim.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/cocvp0kd0aurah21jvisnpothh/lanotagovinagiv.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7f74ceca---23593693051.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xifujobitubu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4a1156c85---forejonejawosoxer.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/31429821658.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kebigegufaxewoseme.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da48f49051d1c0842d2f247054f3b808/kevepupamajomujadijixirem.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/63312792044.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/3nbam56pcjk9ioltb7qbndr7g2/33570935313.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/8552738251.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/10133166602.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/zutuvixegalof.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210731_C3071811F3EDE958.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/7666897937.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/lotevo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/46668757330.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/31639923341.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/85984761722.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/fupubirisodirisusi.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/41407775961.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/lexatas.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/62533268644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=responsibilities+of+a+disciplePDF 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_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 10700 bytes
SHA-256: 24148d8e3a72dc4855bfe550a130a165034deefa7170875c9270beb9c3b582da
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 19900 bytes
SHA-256: 9ffee337092a8c255e6d4e49ba42c71435afd308f05c802ef91ee1aba38c5804

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