Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82ac34d2ed1e348…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 15:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e60ebca97d86ea992f625c21de84c213 SHA-1: 2c8d7ded1413aaa0cd7428673b73508cf212074b SHA-256: f82ac34d2ed1e3485e1a0be260ad90e60cbe1799db0292b307ab251a3aa4f2df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. These URLs are structured as a link farm, suggesting an attempt to manipulate search engine rankings or redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161298f279f8e3---bolonukemusobedanaxebix.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee675d53b3---nesuremebufizadejufax.pdfIn PDF document text
    • http://usateatop.com/_upload/files/21578650478.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/95849086974.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebc6763a9---vemokezagofakiru.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/xudivemimejijetawogizi.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/2368264042.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8428a5001---78277911477.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8ee04b6407df74abac1ea30ae72741ba/46675638393.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/40134275180.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/gilabumebenepakiwamud.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/15582005470.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2c9b6797e3f140e51457fa8fbf109aae/vojazefubefi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2tonsd5gkl4nld7j9gkodupniv/66784526902.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sogevul.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fj1754s5athogdg3cf4f797hh5/81716229866.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l6fl075qm9ok49c8rmemqvfo0c/mulisud.pdfIn PDF document text
    • https://citytrafik.nu/images/file/bowevesuxodij.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/kusufelusutovadi.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/81264826340.pdfIn PDF document text
    • https://numberonerevolution.it/file/73169872669.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/283273728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=class+a+evaporation+pan+pdfPDF link annotation
    • 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_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 18984 bytes
SHA-256: 4e4a0d10a7c74887bfba23adbaae67b13c58af73426a931a91d305f7228b23a4
font_02_sfnt_off000130b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B9 10588 bytes
SHA-256: 3992cf4a67a498346585b41a60f61f30e61a27c68e2b5b9031e7bceb3f546043

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