Malicious PDF — malware analysis report

Static analysis result for SHA-256 a823aee8b30edb78…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 18:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3af0dc6b8aa96e1afb6330f7cb5b063b SHA-1: ee66538593970c7f2b047ee95da460397b321c9a SHA-256: a823aee8b30edb78cf23ab27a8bfc474574cae9accc935ba976712e1c6616483
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous heuristics indicating malicious intent, including links to compromised CMS uploads and disposable hosting, alongside a detected ML_NYX_PDF_MALICIOUS classification and ClamAV detection. The presence of a visual download button lure suggests an attempt to trick the user into initiating a download. The embedded URLs likely serve as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 https://garglob.ru/uplcv?utm_term=v+bucks+codes+generator PDF link annotation
    • https://dm288.rs/slicice/file/49161331583.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e55ae0f78---xuniselepuxadojuxofomatox.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bagenuzu.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/51581459116.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210914043256735188fbu33.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/47227955268.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/juvib.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/34f85301e9c6ee94bb4969df240bdb16/2570176172.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/bubeziviw.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/bewimojima.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/xalejojir.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/7750073300.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/33772680403.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b200af4016---92390365920.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/52232373706.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/gijabuzigexalifuwesutazos.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/88959771358.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1b3304f3---tazoxutenufo.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/suxuxawix.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-12/4d0e18b23f545ef98e5a235751629a77.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-22-07-21-07-66.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_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 17140 bytes
SHA-256: c710b2621c49d5cdb7882147ab07ddacc62c1bff784a03a79f9ac6f0dbac81ea
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 10708 bytes
SHA-256: be7668743d0c5ffc052600940ed33ed6f55540dc2565bcd54a1a373ea8c68127

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