Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8b0384137ccda9…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 15:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 061a05a18c98110f700e3cd03ef3bc73 SHA-1: 759ff835e5c1938177627500667b1d0f70c33306 SHA-256: 2b8b0384137ccda94b94c457fe525eeab75573927401530fb3e0eaa2f8504a32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious sites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://morabia.fi/images/file/rivodotovulixiwejuf.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0ag8clqverqo5dn9m0k8mqna53/40455004507.pdf
    • https://burgas-remonti.com/userfiles/file/57317623952.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d75f651e9f---lawemamureleg.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/31391257423.pdf
    • https://atl-50.com/files/file/danozuros.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2r21ljjqc7ud8p2an1sa7rhbp7/sozenizitufojuxikalawape.pdf
    • http://comlark.ru/userfiles/files/jofijerevemajonunotitipeb.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b25ae619b---12961878851.pdf
    • http://www.aqsclimited.com/EditorImages/file/48690293179.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078935993a16---35637343651.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d47280a197d21e400f83e61dcdc3764/luwujix.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3167d384b6---14288506139.pdf
    • https://sunnyvale.com/wysiwygfiles/file/zimujebubasit.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27a112eee---90944907225.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3c1bece3---74647759768.pdf
    • https://bititechnika.com/uploads/file/kojenolokin.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4f3f9a5fc64e9513c731123c50b5d299/tokokuwoxajafopapevagowaz.pdf
    • http://shuimotongyuan.com/userfiles/file/41185029889.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e50e0e4fc38b0f9279a1618c6cb3f171/jisujimomuxilufulozoladi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6475a82a.pdf
    • https://glycocalyx.nl/userfiles/image/file/segopasekavaduguxunusexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shakespeare+most+famous+quotes
    • 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_off0000ec4d.bin
face5edb06ec3fcfcb366a7fd5caba5ef1e52e8d2b203563553a2f5fecdf130c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 16912 bytes
font_01_sfnt_off0001181b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 16792 bytes
font_02_sfnt_off00013032.bin
06aacc8687719ff772156fcc13662227f21afc13164e3161aaa16e2fa9f9a916
pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 10796 bytes