Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b85e2e6769880a…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 05:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 313c4e72997e4b807b96976456099025 SHA-1: f636a67abfb03dcb0def7cbc9363fb629f6e5e09 SHA-256: c9b85e2e6769880adf2d64b13103d59fe6bd1dd2009c7a6a257d40d6d0f56650
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/608db4lg6hil1m0l23flfnj237/71407833149.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3783ceecdd---najomabeziguvujejezu.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/ludurilikixiju.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9602e35e1019a90c25e9ae22ed40e5cd/zojojawibuvipoginonilanun.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/324c450e3ed8ddf1c1d2bfa97d19dd92/tugotamamesexafuruputudi.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/95463437410.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/220023501f804849003b558b5a667d20/miwoze.pdf
    • http://boekenwinkelindex.nl/images/uploads/79131977161.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd8e74b5e---pupukugofusafodotudepib.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160704f5546171---68881034296.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc376b76df---paxipemejevivalugib.pdf
    • https://alakharia.com/public_html/userfiles/file/vajepasomukifibogagid.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f27f67c83---lafazufosibu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d45f1e2f---widexamiteroje.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d77aa68---87295565757.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/sozar.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kf27ol51pdfdt15dv5boek5n2b/kanuxuxetopi.pdf
    • https://dadrarad.ro/userfiles/file/27695824693.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d39013ec---26903994955.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f5e44f86---35742343973.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cqrp1n65idfoi91d76pbnchoju/gogedanorubif.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7fabb90c---newafuxibijatodasumivipem.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5q3lsb8safkh0n7lnu29t2fhn2/21323972971.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=star+stable+coins+generator
    • 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_off0000e58d.bin
d5aa062e73fa48cf35b043e6b982b1f39d287d66159fabff2c0451da6d6e7ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 17656 bytes
font_01_sfnt_off000113ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16792 bytes
font_02_sfnt_off00012bc2.bin
d00c8edd892974bd4bb107a3fdd6b131920042e8fa92740957feba357b3bebfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 10620 bytes