Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0491b68357592b…

MALICIOUS

PDF

84.2 KB Created: 2021-07-09 11:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c1d70ed8a9d015420fbb48ae565a75c0 SHA-1: c893dafd0ae8d80d9eb916ccd78b2766351e9275 SHA-256: fd0491b68357592b89fde2803db87c714e88a276dd1612fe66d28474a6ff9abb
232 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The presence of a 'password-protected archive' lure and a 'download button' heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript and numerous links indicate an attempt to redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sl-light.ru/design/img/upload/file/76142435616.pdf In PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/11722682019.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c033dba41---lifikutolofutiku.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b298c2af61b810865e7a6b0c91c8dc7/48316428900.pdfIn PDF document text
    • http://ozari-ua.com/files/file/fofeje.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/28149275811.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/xituvu.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zigutivikitabuviziguvur.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38b9257d90768a6bcd9ca815afcb96d0/4077389839.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0ae4bd0d---58057936196.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/natukeponevegegovovire.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/84fa4f73af7eb79f8d7d7ea624da5483/57257664362.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/17016728691.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210522045509102.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/gezev.pdfPDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3b73de6c685dcddd0679e55947df753d/76168266396.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/71969051603.pdfIn PDF document text
    • https://menu2uplus.com/images/file/16720124173.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a0e39aafd333025beb40e85dd6f4fb2f/bevuzafaketavunepalalem.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mazuxesutewusavifiki.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/30900089068.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715a8febd8c---81836085666.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/9159162102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ultrasurf+19.02+free+download+for+windows+10PDF 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_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 11068 bytes
SHA-256: 1b0a75cfe9173967fcf395cd3563762edd3d89fb840fc931c855b8368d4363ce
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 16256 bytes
SHA-256: 8cec6a2e8dad7bdedef10d1d6fa106fb8aed7196f2b6efd6d0116c3b78609414

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