Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29d1007957ec15f…

MALICIOUS

PDF

123.2 KB Created: 2021-09-16 23:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bc53131031812766bf05782f25e736e SHA-1: ee8f644b6b1aed941520860bf8ef1f4ea90c494d SHA-256: b29d1007957ec15fe8cb305e1a2e060204ddae50f5df9591fbc9b1b17d5c29ef
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to host or link to other malicious content. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent, likely to lure users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 5

  • 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=nama+pubg+korea+di+playstore PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881a2df862---funomakefagijol.pdfIn PDF document text
    • http://checopharma.com/upload/files/19575788325.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613573ed35be8---fupagex.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/virudulamizitugel.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/semag.pdfIn PDF document text
    • https://sanidom.pl/img/file/34861874068.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142da19eb039---lawirojabebumamesav.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/xofobekelonumusajogugazi.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/gulugavepumefowus.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/zebikoripoja.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/biguradoverilosipazoj.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/16274925138.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/22842426162.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/44221030984.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/21196724998.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gakfihhihv265cgqkkhb8lihmd/figikovagalofamuxanujux.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/fipububatora.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dfb06a14ead873e54235d5ea437b90a/fijonulipugibevejibexab.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/mopozenizujewozukese.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/pizajuririjunib.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/76009216286.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/9046117526.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910101139.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/86840128253.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/29352299885.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/32707547757.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_off00017c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C31 11052 bytes
SHA-256: fb0dc01fab3bfd47b209fa0bdb6b1976adb0278862465ffdfeeccd2e49d672d2
font_01_sfnt_off00019591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ada3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA3 18860 bytes
SHA-256: b04d47ac8fecaace7cb65b43464d5097ba5df331c109081b509289a73d32f7f4

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