Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d2f01b1aaa6288…

MALICIOUS

PDF

124.8 KB Created: 2021-07-02 09:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bec08cd10bc6d71cfce47ee9b4fbbea SHA-1: aece3588db8afdbb4ba113d86a6fd26db7360c11 SHA-256: 43d2f01b1aaa62883113f34eefbba1e0eacdc3d274c9882fc6e879e150dc112e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9585

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 http://urjabatteries.in/userfiles/file/83321743906.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/316d5f10da7f45c8e5d76e0346020dfc/16992718312.pdf
    • http://goldnumber.info/userfiles/file/matetudamu.pdf
    • http://watthaistuttgart.de/userfiles/file/posivezigasila.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/36bec79695499ca2639735801bc18b19/ferinamitigavusivulanus.pdf
    • http://elitaliaweb.it/upload/file/98826361217.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41399b2ac---46880089170.pdf
    • https://harkakotony.hu/UserFiles/file/roluzapukemekotemolomelo.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/18197630573.pdf
    • http://watdoenwevandaag.nl/upload/73713696216.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5b9aa7558b65ee2e0fecc2fc6ad8b104/mipukarepadaxig.pdf
    • http://holidayservicemarsala.it/userfiles/files/dijogatifuzijuvukarikik.pdf
    • http://archi1919.com/smlclub-files/file/59491344831.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/55211aa407e25cbe7284473f93ce3b2e/puwinirejudavexuluvo.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc851c33df---sawidabawoxokijavixifab.pdf
    • http://asesorgubernamental.com/images/file/35845947845.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160762b52281c3---dabiwulugewizalunipuripi.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ffe8631ed---69694201988.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i5mcdopj6rsbggdso9qcfp79d0/geximinebebofoj.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3d6e1bd91c603f9288d7b5c9300c1052/wulisurofovovawekegefo.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8c23be0c44510b7643237a52a196ea66/34651603397.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/eef8bce0c59c90f763f8f2576c31b8c5/xikowejosebewes.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ctna6cukkqhol1jm73etbqj381/4562341686.pdf
    • http://kfbi.ru/content/file/vidurokuzofeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=according+to+that
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000187bd.bin
bf7406d77fd5b0e5106b520ef9e6c3b71f7b0db51a68234d89aafb9fa1d887cf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x187BD 29300 bytes
font_00_sfnt_off00010c9d.bin
650e10cb16b8771d29f9d150b13e687d6da16c56e02a12637ffca1a8dc1f8f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 33644 bytes
font_01_sfnt_off000158ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x158CE 16792 bytes
font_02_sfnt_off000170e5.bin
ba7b33fe650ae08ee44fb7f29d75474c6801272a0bd2e86854e2a74391d6977d
pdf-font-stream PDF embedded font (sfnt) at offset 0x170E5 10284 bytes
font_04_sfnt_off0001c227.bin
1a08b453af0d3f61691acacd7c8e47776e08d686fd0dbddd867dc12aac9b5178
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C227 10700 bytes