Malicious PDF — malware analysis report

Static analysis result for SHA-256 61381daa045edbcf…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 16:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 123f0487affa9fdc01632d27cac2020b SHA-1: 4cecfb758a067a9d62e17793bc491a12636ce167 SHA-256: 61381daa045edbcfbf43d8b59aa424c898dd8d0ca29eb77c0230dcceb4339118
164 Risk Score

Malware Insights

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

The sample is a malicious PDF containing embedded JavaScript, which is likely used to redirect users to external URLs. The PDF is also identified as a link farm on disposable hosting, with numerous URLs pointing to compromised CMS uploads and potentially malicious content. ClamAV and ML classifiers confirm its malicious nature, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://drafthe.ru/uplcv?utm_term=magic+the+gathering+official+encyclopedia+pdf PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8b3d5504---7849401454.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/fonixebofeb.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/1138795219.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f226e63430---57088336987.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/34303021544.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/94nbc1rls493o7ke8u0rl50cb4/xewubiwexeb.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f3ae82e1---dirurofaxavowadi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6376fff8---77209022589.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624cd34479---waxekuzovu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995e7ff2240---xilew.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a8725286e4869fe2bf7cdbabcc37aac8/70724422164.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/mojebikisixuboz.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/50999800489.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hr0p9ne0vtejgqgj20sjsc40la/nises.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/xilabawidimuzisupirufe.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/45b48e556db42644a5a03d061bcc5a11/72871508863.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/93499774204.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b348fef57435f7106a734f7c1cb91bb4/tomefawumopajetutemuna.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a14685dc---momep.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/de7acf0e73dbd160809fb0b17fd7c04a/19717286195.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d282f35a011842459f22627e29d2bb54/84076152787.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8623b44dc1---mafuveledekiwi.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/83627469191.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/67994048127.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/igfofkqjrhblnjpjfi3u0eqda3/xajilupajugaboziv.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/79gku1qkn99v8sgubnpvkgp9q2/85416531840.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_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 17180 bytes
SHA-256: cfe07088871c23c29225412a7001cf0498ce1755616b383b166e6959720ab1dd
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 10840 bytes
SHA-256: 6391ad496e53fe9a72ea2ce5fa984c8bba8e124b57cd6dfd8545b1776e829e2b

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