Malicious PDF — malware analysis report

Static analysis result for SHA-256 039e4124ff46b8d0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 05:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a889eeeba0c4422b13e0c22655c6888 SHA-1: ebd235f018ee106abf4e73c6f880df4451cbab33 SHA-256: 039e4124ff46b8d0ff0b5da85c19dd35c7d1b31236811761d09f8964662e9659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=jquery+mobile+for+android PDF link annotation
    • http://mega-treid.com/userfiles/files/vubokoxaradomadonave.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210909182507808846jw325.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/vanemizaxuk.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/75409101882.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b0c2f7dad988a4835d8da2e740c64cd9/gujobapubezatux.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328fb3494b0---82097308658.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ff989325c02c68a764ef84d632eccec2/dawixolefejo.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tigetisiruwujoxafisemi.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/77645370103.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/14434851181.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/jumijinalokopumifaw.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/23729354154.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/36383243573.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92fe0aed27d6cf5762d3ce756d023bc4/53301222057.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/62133201016.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/rarutiluzutunifo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/73a289ef0ba16c6d1504fe7697569b23/19874629479.pdfIn PDF document text
    • http://denge.aero/upload/files/werizazarexuzenuku.pdfIn PDF document text
    • http://ktcz.eu/files/files/2908032471.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/92470305395.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/naxugefuwokujujoxapizux.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/36845943394.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210906_135246.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/71129855083.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45150940365.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_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 18872 bytes
SHA-256: 9b6751612e87faa9df4cca3336b85df0f9d59fcda42b9c9b75acc702ceb345c5
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10740 bytes
SHA-256: e7873252dab38b9d9c1ed244446e58246cefc152c8998596311ee8eb6dcf6e83

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