Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed0e60be6e926d1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 20:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fee8f91ff00fae7ce066cc29f8946f4b SHA-1: e56d678d9d136186a0dbdfea3fa0402b05810c9f SHA-256: 8ed0e60be6e926d1a2f38ddca3943ac8a477cfb37263e10fc7156eddd4a93d5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://isleo.com/i_photos/file/xovebodasetubatuvopenes.pdf In PDF document text
    • http://gjbbang.com/userData/board/file/74339224652.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/51cfa85de264b03810a4fc9257866c01/56015171463.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/71848301941.pdfIn PDF document text
    • http://halanmilk.com/upload/files/juwasevimejelavupus.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fajusetik.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e64fb3374cf---nelosabawumokaxebozeden.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/lagobarepulevoposonatisuk.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/27938870781.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9f4a1f19f2ee01129a250734c69604a5/42836093386.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/xiveliwugovulazad.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/60088967190.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33983f7b6---18110294445.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/vodibekivutezibidapeg.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/87349800433.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/56731672676.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/br3gkshnler9v5mkl35c8v3h84/82805872329.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083539171251---vebirabul.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/74926903405.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ac8lda1sli7mj8dsgd5qhsp0s3/78200886635.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a77a85f25---dovugilokexuvivejazetala.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c99d8553a---18662240185.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e7734a24---8862267887.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/76813767425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ielts+speaking+sample+answers+band+9+pdf+2019PDF link annotation
    • 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_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 18212 bytes
SHA-256: 0b8decf5ac0bb7122be4eb261b68531144a380a67649cc437100d4ee521337a9
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 11452 bytes
SHA-256: ae02f517ea7859fb6eef19fe0c579fd2ab555708ec9a3f123f0d9db86bc8d279
font_02_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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