Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20b01282a08910e…

MALICIOUS

PDF

96.5 KB Created: 2021-08-22 03:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c5dd3e6d7128f6ae5fd837bfcd04e2a1 SHA-1: 1ab813a9420862db49ba8a64b77eb22fb06f3f06 SHA-256: e20b01282a08910e2bef137932bc2b79311ba93d65c3c9e67889b6e2dabd4faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content.

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a1e2f094ec66ee7c298dd55600566b74/levasufegekisatupo.pdf In PDF document text
    • http://csc0311.com/userfiles/file/20210706154650_m4m3sg.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/lowavililetap.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71d104109---92452345013.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5dc1d177ac7767cea20f95645a7cd885/39862616126.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210604114358.pdfIn PDF document text
    • https://datawire.gr/files/files/62700427890.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/88431687804.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4c7478b69340e36f01f5ca67f452efac/93214003120.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf7e20f7f1---revolemufamaxezalir.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946d1c5cd1---sujemorerepu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e993281c---58693657692.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a40a41dac---8350616574.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/76037688754.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/marugopularidevejakoxe.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/42305963408.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/41273332017.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/49616352963.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pilolubu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc11d47b44---65794341697.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/57b4352c5bd67fe5b77ddb34b8d933ee/58856392353.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/zorutebojugizobavokofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bissell+proheat+2x+revolution+pet+pro+repair+manualPDF 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_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 18604 bytes
SHA-256: ff03b70e96199935156162be2ac1392a09727911000ff034d1009c3dcf2b99e0
font_01_sfnt_off000142cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE2 10956 bytes
SHA-256: c6a874db9aaaedafdbc86862229f6da741c122905c694d3e671632a1ab54fa9f

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