Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ca645051fc1298…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 03:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3a3975128bc8f5bc3ddcdf5934960612 SHA-1: da5990b39d98a6605a17396e4e16e9dbb177162e SHA-256: 03ca645051fc1298fe0287fc4171fb6cd4388fe86da9907d03a1d7472c62dd78
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are associated with link farms and compromised CMS uploads, suggesting an attempt to redirect users to malicious content or downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=final+fantasy+3+cracked PDF link annotation
    • http://aptekarynek.pl/zdjecia/fck/file/jekebuxivotube.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/61195063195.pdfIn PDF document text
    • http://mrybalko.ru/files/90917793927.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/53188673047.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/ritawir.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/mutadajog.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/50677291351.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zezevobatajewus.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/26129893564.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/fumalume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d2ff0c76---nivumobubutijovin.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/dekigamufotuvovidu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142469532d5b---56596631194.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/23720364273.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210917213150.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/zaxagusur.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/bipazukajipize.pdfIn PDF document text
    • https://membermimpi.com/contents/files/13037973710.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/femuwazil.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/48544727073.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/31301044129.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/21764998994.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/kanopegife.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/37398009834.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a90b33abb53fd8d02105e40e9762530c/borodixepozidekiniz.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 17304 bytes
SHA-256: cc7b728e42343b7d475626945523a86c483ac20f9a41ff7ad25c32f593b93243
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 10704 bytes
SHA-256: b3de62c00b48dcac2c12cb4993ef9bcaf91329183b6713693b8fda2aca1904bd

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