Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14ecb0e139bef12…

MALICIOUS

PDF

88.4 KB Created: 2021-07-27 15:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4532e17f9189a93c8c1ecdc40e0c9642 SHA-1: c21d05ca1bef465d2f5520464ca9dcd3b75499ba SHA-256: d14ecb0e139bef124ba15472cfffa7d8da85043cfb3ea34891d32602bb502c74
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ankaser.com/userfiles/file/vimoriso.pdf
    • http://pizzeriadevita.it/userfiles/files/6268740106.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc109c0ee2---womozafuj.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/29090400639.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840d4fa84ca---98284501137.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8kgodavc2q2v1evt89ch982ouk/89889712772.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb951356e8---gerexelu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6430d3586e---zorapajare.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/bowenovumirepizoguri.pdf
    • http://arcenevents.nl/site/upload/files/49706707844.pdf
    • http://alliance-ic.ru/uploads/file/50500611962.pdf
    • https://go2germany.ru/files/file/71020255875.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/99829425854.pdf
    • https://parklanehotel.asia/userfiles/file/ruxojefilexevamivedup.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090031dc471a---jalov.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5cb875bdea08e0f7d65af2a8d2dade8d/30960790383.pdf
    • https://balajitutorial.com/admin/userfiles/file/xefekeduka.pdf
    • https://machinex-machines.com/UserFiles/File/43993220239.pdf
    • https://discovercefalu.it/_data/images/file/vusewelekufobawajobara.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde827a24b---56166427260.pdf
    • http://denki-shonan.com/uploadsfile/sizubanibofudizobo.pdf
    • http://luberoff.com/userfiles/file/54153882816.pdf
    • http://papinchess.ru/userfiles/file/vewogepififojogobi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pesquisa+qualitativa+explorat%C3%B3ria+segundo+gil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 16792 bytes
font_01_sfnt_off00010a22.bin
2d330f499f41271baf129a21fff62dac6d2a20b80e556fb4022cb75998ac57c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 11120 bytes
font_02_sfnt_off00012375.bin
ead10defbc27142a47fdc15a276f6e545a3293e5e37abab5326b885dfb7985c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 18452 bytes