Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4460567a1c5adc3…

MALICIOUS

PDF

77.3 KB Created: 2021-10-05 19:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6d63e45437c5e5f0962ba4709c7ea84f SHA-1: a38caac0b3f216d4130490b63981d8f84e3c495b SHA-256: f4460567a1c5adc3c932a165f82a053fb7f3d9413d6d9ba1c04cfe14a5298e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=10th+class+maths+bits+with+answers+pdf PDF link annotation
    • http://dobrejaja.com/Upload/file/ragodobopodilolotil.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/54565604521.pdfIn PDF document text
    • http://kdekdyjak.cz/data/23571577747.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/14999090498.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/30997003794.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kapuxitigig.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/fabadirotejifofoxiwenaxo.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091620104873499.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/sanif.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/tobanulifanimofojezi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a4379c3d2eb2d2255188e7a68412e20b/2795430529.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/vopexasirupapevetaz.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/5014656388.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/80072401089.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490f0681bd7---38127259364.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/73553185736.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/bidukuruxufuxalu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161398bf03e247---tigeletuzuwitugogufogot.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/gogekakutaxufuw.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/tusupikewedubodupazuwomox.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210914022528.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84353093950.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/82803007516.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/vafapuzazunimulegura.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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 18888 bytes
SHA-256: 1571bfc8f219ed3f6ac2d41e753d4c1a769b74e6967c48e11ccf05001a2c76fd
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 11068 bytes
SHA-256: 36920ed7499b52a8384058969dfc7f144c0ae155b3896c9e6bb329b9bd8370c2
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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