Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e1f502f3eda67a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 22:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecda462d34aebc3dd56d17674e5009b8 SHA-1: 578e3152c315fe32ff34e42020d48628ce03c7d6 SHA-256: 63e1f502f3eda67a9c10dfa6d0f5d75539bcb5cdf21b54eee8a26a2bb6a87fd5
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript further supports the likelihood of malicious activity, potentially used to redirect users or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=adb+driver+zip PDF link annotation
    • https://aromamarketing.md/img/files/12942260207.pdfIn PDF document text
    • http://regcureguide.com/files/files/88693075279.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zumozaxo.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/jewobetubufidulofapiwudu.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/fezapuvevejasetabav.pdfIn PDF document text
    • https://mbbs.hr/files/7059757119.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/panazezeduzeleloja.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/87796570925.pdfIn PDF document text
    • http://hkalc.com/userfiles/41340288639.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9262447b---noxovilexixusawegokomi.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/lotasomobapan.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109090851173968137dvu3.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d183adccf---xavixoseridegavirajina.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/689df9c2efec201d990ad88460995dc6/xigekuwexuzof.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vejuwu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb4eea3bf---27632907971.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/tatipaxe.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/nisudisaguneli.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/39460936254.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/luzufodobogipixewe.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mfe5potjjv683d335iasrhv9p2/putewobipediw.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/97666474266.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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 17696 bytes
SHA-256: 97b012932e06ac8f4ba5d5f1dd85dc48cd8591deaeda2edbb9d699eee7bdf29b
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 9932 bytes
SHA-256: 74ade41fd1292f174bb9c9712c6f427113872cba6fc76bd80cb024782b22d092

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