Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98646ecc73d83ed…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 20:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e45873f94816ee8301931ec182d69fbb SHA-1: be11a0e8de564efc370407c585136cd81eae1d33 SHA-256: b98646ecc73d83ed5cc92de8176a2e4a6c3fabbc57ea54b8366d864ea30f77ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to attract users through SEO-optimized keywords, such as 'gta 5 download for free apk'. Several URLs point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://aa-nusd.jp/wulutagajobajim.pdf In PDF document text
    • http://train-in-japan.com/images/blog/file/nalixavibasave.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/6977395442.pdfIn PDF document text
    • http://zuche0551.com/upload/file/69833661907.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/gekogozimosixunolitox.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130747b319ef---1257995867.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/93482783754.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/47649670656.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8e93ae656fb685cd7dad995378bc3303/jenejop.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dg6c0phonk4u8cj2oqdohlo7f4/xejanusefudomesoluluzew.pdfIn PDF document text
    • http://skia22.ru/pic/file/94636934198.pdfIn PDF document text
    • http://rjt1.org/upload/files/95177366030.pdfIn PDF document text
    • http://parentini.it/userfiles/files/mopejusuromupe.pdfIn PDF document text
    • http://strandedtattoo.net/file/debusofaminapilobara.pdfIn PDF document text
    • http://3asoft.vn/img/files/fupejefipewotipajulufe.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/88136521720.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/kemowumikidozofaliwe.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7730ed076a583b0de3c633db526d2c19/gogeg.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/rajipaliw.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/kolarufinoner.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/rafawawopiwirusawuf.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/932d055f0b3a4e364254710c6ad3806c/56965263430.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/57457590765.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/47193608394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+download+for+free+apkPDF 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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 14676 bytes
SHA-256: 3a77a9f86e0efd48c41f13eaa6fa1fa6fa27dc1a29dafdd4516dddd4faed0d12
font_01_sfnt_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 10584 bytes
SHA-256: 408a6119b6597ce7c2526bd264f5c8686f9e4ca72077bed8318f12a4e3ad3116