Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f07fa9ac56b05c9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 20:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1c121cb9f4e9d9827f18e973eed9b15 SHA-1: 6a37e31ea34673ead1021716a7b96f4b3d71697f SHA-256: 9f07fa9ac56b05c9dc3ecd5ed409f4df743f2a6957da979cf5f54be179daa925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=properties+of+powers+and+exponents PDF link annotation
    • http://kientrucsangtrong.com/plus/files/dimowuziwulorokobi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/663d5f8d12d73d62f69a8057ccc8968d/kesaxiwazav.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/69267368498.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/48519003355.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/53852020882.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/71559743700.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/xidebaw.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/lunojumanazekabeno.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/39267412058.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/raguvalufukari.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/89825136606.pdfIn PDF document text
    • http://gr-chem.com/upload/files/65871503527.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/80961823677.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/10774510570.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/58781473639.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631721314371613851.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/wesopujaditole.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341372398e8---59437145497.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3dg3hn4jlt1f8keng0su8ugds6/rosiwuwaketelidagosik.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/borumewozavewaf.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/gusonadadunamamojozegolu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370eb49cdec---77026341689.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/16744231055.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_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10636 bytes
SHA-256: 49daaf7039c50d6a9f0d8fc4c4463fba4ac70b76d2989373547f4f587c75f83c
font_02_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 18724 bytes
SHA-256: 8428dab184691ee6df45879dd743f358d52f6aada6b63fa187ca80be05db2829

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