Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2f695228232701…

MALICIOUS

PDF

73.2 KB Created: 2021-09-23 01:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52b93609c7502316bbd2512274c4a598 SHA-1: 611eb60cc1f769e92e7400e173735718be320e11 SHA-256: fb2f69522823270197223f5900ee3303ecd12ce9efa6110e2e77acd187d0192d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely intended to host phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://garglob.ru/uplcv?utm_term=how+to+get+widgets+for+android PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983e70c9e3---vokafokixafevorugivoku.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/39892215383.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/domar.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/73652473554.pdfIn PDF document text
    • https://servauto.fr/img/user/file/28505121309.pdfIn PDF document text
    • https://clove7.com/userfiles/file/zovadikumudotamix.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/gilazunerasekanugem.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/52342591004.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109090800011749.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/59148801737.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79d8e2a1d---sojebagalasomaxuxavov.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/jogetosonupojajurize.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/56606818890.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/51245554411.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/newov.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/vedefelodokekig.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/34753760374.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/149c65440f40a55e27c7d06a609be231/69786686794.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7ff1e14d4f19e50eb3156887ba4d1b51/xuwogarukesutifotu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/425529877bd0922a4729af34791e0444/xogowamavefekomegesudawi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144358b4711e---76899367072.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_off0000bb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9C 16608 bytes
SHA-256: 293879c915d0987bb68830e4557cdfa47f5007d1bf95569248b4108e03168dff
font_01_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 10560 bytes
SHA-256: 18eeca66d14bb6fbcd7610b13f4c8ad6c80fa9e3b64e244f58fd31c9012f4b72