Malicious PDF — malware analysis report

Static analysis result for SHA-256 2467d4ba2e97a9f5…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 12:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dc08286bfab5e55bdfd094e3bcda472 SHA-1: 15c1806c6355a601cd540e75a1a4273a1c4a57da SHA-256: 2467d4ba2e97a9f5fe038eff2465eccbcd9ef038f748f3d217df986f2e0ab012
156 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to potentially compromised websites, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=download+ringtones+for+samsung+s4 PDF link annotation
    • https://nomaquito-travel.com/editor-images/84221253627.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/45277684199.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/91128927526.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vp51sqssibdn0ouk9tr5ofbihl/wibejopawidaratetibazixu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pai48s5gbbnntt6j947eugd387/xakozizatojimekavu.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/sekigakov.pdfIn PDF document text
    • http://dasbluemchen.com/suvigalesinekixawa.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/semuketumijuxa.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/36676188525.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xuwupifun.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/2807632651.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/7040578564.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/lusixusabi.pdfIn PDF document text
    • https://capecoralliving.com/media/file/mawifatit.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/nagisekojovopidoruwa.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/xavujeren.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/padozod.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/samubilula.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/2892971549.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/5052307471.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/81347518174.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161381b3c6849c---30310935937.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/23949772211.pdfIn PDF document text
    • http://hangquangauto.com/files/61437012045.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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 17576 bytes
SHA-256: 00b1a84289bbb519ebfa9b69c221890c8e72db9e896e28841ad5bd66b8fe8baf
font_01_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 10960 bytes
SHA-256: c0c530397e0ca876b6fe1ec6a49ffe1337e5aaa0936f82ca1ae13bc243dce860