Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5f9566bd709e12…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 15:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3753c0f89ea5cc1d61d26a85f017cff SHA-1: 09df1921194fb43763b1a37b7b7ec66c41703aa4 SHA-256: da5f9566bd709e12a6048a21fb4b52c009e4e957b528f8c25ebf554f959e8f6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=pygmalion+read+online+pdf PDF link annotation
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/33536541964.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/nigadisekagasexetarorazir.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/82171692090.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/4864955122.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/32323993954.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/27837702173.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160792a4e59dbc---rosigifomus.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/wamovorir.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/naluxole.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f98c07361202af26b98ba6d1628b2eae/vuwetulopu.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/kirejuxanap.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/foruvixar.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbe27be23---92076829350.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210612191220126.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lgl839ca61v6q8ddrmjms9l9n1/wusolovakofaz.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a66052690---noguwiguv.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6c4bce1c---661233174.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/71878919220.pdfIn PDF document text
    • https://tsegypt.com/file/ginikogejanizakiriwamof.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16093b00523308---99185809101.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35c064eea---wevuzogoz.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5ff71f6aaae3bbc77446a780de8470a6/vitam.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/71442791340.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/koriwotixepevemixapofut.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0374a2bb3ba360fb65535b231dd8b877/2728818216.pdfIn PDF document text
    • 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_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 18084 bytes
SHA-256: 3052b42c8c051b805098c91138ce4a84ed2329e8c94af2dbed853a456c8cdb43
font_02_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 10692 bytes
SHA-256: de00834652eedc95d1b382180cb8ac96b18940afa5fd0ffd4fd0673b01d4f2df

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