Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c87c995f879831…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 05:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: af90619cbec40d9b019fca86c658a9a3 SHA-1: 8da3c0ae52c35c646f3806ee3fd37bbc4b155191 SHA-256: 75c87c995f879831372ddeb496566e3baf0b7e7565bbe0906abe2df40e43a0b1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various compromised websites. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=best+useful+android+apps PDF link annotation
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c26488922---gewamewakibaxalomi.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/59890385983.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f90cbacf91c6941e7426a86c4493508e/40011200884.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/592117539.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/65578627477.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d89553c462b115a84bd0b5733c3bae83/mutuvevotumiragegovobewaw.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/dozurura.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/809ee6028cd833a74be9fe62a7c34d9e/22607576866.pdfIn PDF document text
    • http://zae.me/datafiles/file/86037473226.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210910_151715.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/2945464864.pdfIn PDF document text
    • https://kermanrooz.com/img/files/vumiguvifalilabo.pdfIn PDF document text
    • http://analhospital.net/file/files/6212704542.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/fixewomoboledif.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lipabidamewi.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/88232996155.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/purewimesijuxediper.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/52909400350.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/12423198743.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/88177070949.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/72438595539.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/konisurewilusozigok.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/24925474241.pdfIn 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://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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 17496 bytes
SHA-256: dd5f66ca6ca56ba4292a9d02f091aca914074cdb1db6fec0c4e1fc1c461a4f64
font_02_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 10644 bytes
SHA-256: efd7758f788f8aa3e99c41a6b98d4ed6b368d6be49ad74936adf10a3477962e4

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