Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb590b91c7fa131b…

MALICIOUS

PDF

89.5 KB Created: 2021-08-11 12:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c420e7d3b520a295eb8880d60389c40 SHA-1: 8dcead8b95e3accfd391ad734ef4bcd2f06d2007 SHA-256: cb590b91c7fa131b073d567300670d293f9de59ea28febd9146ddf6a12bb4f6d
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca63ec146---76243457027.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ivmhfn5mtik19a7kpqa6ip8h27/kinolurutege.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/gadulorawisiwozumeduredi.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/41890453348.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c5410404d3d---rixad.pdfPDF link annotation
    • http://coinproject.com/userfiles/image/file/nasezufapepeponu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf2cd8860---35823035002.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/gabekedavoboxub.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609037d1bb5ed---1271925142.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac65909cf8---zawesoxofe.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/lanexu.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/37035911461.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f97cba6bec8b581789066d2ed812443/88374991267.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/biboredazoxen.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/72146343957.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd9baea023---61317574111.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5f1262c5---lamabiredivi.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/43800458598.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210802014851565586resvc.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0e674e0a---56807486696.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a764d33e1977023d1dac0c2021047d97/pipofumamowinodom.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f08935afa---nuwaxuxusazewawulava.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/88742814565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+pair+anker+soundcore+life+p2+earbudsPDF 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_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 17728 bytes
SHA-256: 36c38d07629b3d292ea20d0a1e3c09dc131f7f1735c1ead7f906b4998679ce82
font_01_sfnt_off00012545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5C 11140 bytes
SHA-256: 20f4bcc1603b94dec3780e93d8737d8240fd7113f838be9795d2c04bdd7e14df

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