Malicious PDF — malware analysis report

Static analysis result for SHA-256 91600477d2f9cebb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 08:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e8b925ec0a045550e049837cf0cc230 SHA-1: 64d4cf889c66357084aab4388f7e109d0cb84915 SHA-256: 91600477d2f9cebb42473f9d1380e45d5038a192721584feac108d2b610adda6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to WordPress sites that appear to be hosting further PDF files, indicating a link farm designed to obscure the ultimate destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a tactic to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f2f33f088a8892a915e0eab526cebeb7/39375705364.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/58685624117.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jugavu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/pedujizara.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/93d605805edaad24b903c1ebabbdec3d/vanimonevorewin.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/46344552210.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/4897261901.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/27125768498.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/vapujetivojowisaso.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/subenipopelav.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cf7315a88---59860701959.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160948d195c389---49334417442.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/31513641457.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/zatupapigubafib.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/gofabe.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c882e54209---wigufifemetanimifemaso.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608901cc4d783---48940836930.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e7938f5ca8e---bawodomafaguwifij.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/zibefeviwofafinewozir.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/lusedada.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/89724405699.pdfIn PDF document text
    • https://langumeistras.lt/i/File/35257109878.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286c947674---54500918960.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f376db0802---pamufa.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876211924c2---jobigukalajexakenudasa.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/xelabositinovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=frigidaire+gas+range+instruction+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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 10788 bytes
SHA-256: 70ec34a0dc7210cb3838cd474b1d069646047dca58d5e71b32675b8d69ea857b
font_02_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 14992 bytes
SHA-256: 6cba5bb773a5d5fcce63b8c81336f788f6135a7216e8e12d5f8fddc32d3f06fe

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