Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6497902361a7372…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 04:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c895342071c4c470a9e334ed429d171 SHA-1: 61e48a6d6ba467950dba8d7437ada01081938bb2 SHA-256: e6497902361a73726134e414194aec864c1ba38fa97d2f18fa843fa2a59be578
204 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The 'Password-protected archive handoff' heuristic indicates the document likely provides instructions or a password to decrypt a subsequent malicious payload, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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
  • 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://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/g4agn1hqssv919a8kbdanuc330/nadajufalevoniro.pdf In PDF document text
    • https://bdaudit.ro/userfiles/file/49340119794.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/falutulatalujugujijili.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8774a0a7b5---solaliturag.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/7766348925.pdfIn PDF document text
    • http://teplospectr.ru/images/files/neganikutu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf215034dd---21662739056.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/6361516871.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/foboxidi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160787505a5996---86303715348.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/48657911265.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/4pem18bdifrc32joi02o1hdj7o/67897724290.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/245ec84225ee452dfda5f5f1ee9d3134/pidujogi.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e5491d74ba174bbb1e670404998b57b9/jazoriwubekuf.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/9451774528.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/54290054333.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/xakobifuxi.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/voxosujuri.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210617_204635.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/47810518730.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/lozamefarunomur.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/55258165120.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/28077333924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=intimacy+after+infidelity+pdfPDF 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_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 10560 bytes
SHA-256: b99a2ced05efa6f735f1ec584dea91561b86debe1f3eff4b54d9cae14766471e
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 17420 bytes
SHA-256: cc5128bd8a511fad0ff04b4a6532fa9886f047a39324c6a5663fbc9a67b8f576
font_02_sfnt_off00010ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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