Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea9818a98528e05…

MALICIOUS

PDF

85.3 KB Created: 2021-07-09 22:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edd43edcc5d3e6a8cc39e8493053bcb6 SHA-1: 6a7354a50c5d1864f48a95c1013a34bf721ffa36 SHA-256: 9ea9818a98528e05907407804d60fdf5d3981d1c7ec5c3cf706fad877bb9e59a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1e2f0d8e2ae5baed32d79ee2c9eb9984/nugopimof.pdf
    • http://mbcasc.net/imgs/file/xujoguzojuparixolivewibo.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092936565751---kalefegapefulasal.pdf
    • http://adamlegal.com/userfiles/file/xixukulav.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/h7hsjmbn321til50i2b6r40ffv/jipozivesararebegamesezi.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/936085354609fb67d24b00.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b66a05462b5223147bd0af25d5dcef07/xowiga.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/df4438a1d862f3340d46bbc8bcda52c4/ferimirisuzopute.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05c879fe8---xatebifuk.pdf
    • http://ameshamagazine.com/js/upload/files/josepabudumebu.pdf
    • http://palestraarkadia.it/userfiles/files/13369455638.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca540c779---duzadinazav.pdf
    • http://jshtextile.com/UserFiles/file///65141157883.pdf
    • http://szsahsh.com/uploads/files/1083521313.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/949e73b106a27cb121c5c56bdde65c57/jebinovedapozaviwefek.pdf
    • https://btegypt.com/file/68993794997.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e34bc5cc1eab5e3318e83bb2dfb452fc/xutewivabuxudevuxapexo.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43ba5030---1878075249.pdf
    • http://twfbs.com/ckfinder/userfiles/files/89746424739.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ifrbel4op1edikb741t7e07gt6/lalewapi.pdf
    • http://liga-stf.ru/i/upload/files/81341728133.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e50dd585bd---wevekipememowatevu.pdf
    • http://utuin.net/files/fckeditor/file/98707802918.pdf
    • http://remobudostol.pl/pliki/45220575174.pdf
    • https://cecprint.com/images/file/95179997224.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=motorcycle+all+parts+name+list+pdf
    • 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_off0000eb10.bin
d90480219a4b2c1e2634c71d58a90cd29ec0322ffe208e59cb709d5c33a76cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 10888 bytes
font_01_sfnt_off00010449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 16792 bytes
font_02_sfnt_off00011c5b.bin
4a1080f417d00fb69a7cfc2ce05c251bcb7e83616a5b2631da1fb3a2d6c11a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16700 bytes