Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a02c867352d442…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 02:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75b4ba2ec4371a46268fcc1638dd7c6c SHA-1: 03468546f894c0d94fd4a16eeba194f808ac2f5b SHA-256: c1a02c867352d442e8f70b087f628a8b4522ffb67cfea8c23c930b5274759323
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. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1f4d7d5cf1e44299eb4e09202352f168/73583435043.pdf In PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/jozevoxab.pdfIn PDF document text
    • http://innersolutions-uk.com/file/9704099068.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bexilalilewedorejojet.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/kalelebuzopodixu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbafb17e95---fepevikilebojufaxabigute.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vemikikasi.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/tupoxafegetega.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/sewalamatifomugame.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/21406984756.pdfIn PDF document text
    • http://pinxedien.net/upload/files/92133789700.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/xalutesuvipup.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bsdbad4l5f147jjv03ops1cbcm/34760628869.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/metudijuvizipepelusoj.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/pinorafevojevadonufuluja.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotolejureso.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/63664769083.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/66710901798.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/moperiwutikilitaxakud.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/liputurana.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e0d3afbc---39151134885.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/6342804170.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/korogir.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613927c51fe26---tapenibutonadawiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mindset+dr+carol+dweck+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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 10784 bytes
SHA-256: 3c0c4fc555242d3032f4de37861dbcd81e9cf7b3a1eb657f51648070947fb5ed
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 18516 bytes
SHA-256: 8b01dddc9aff4d4a06ea4a15f0c4d4a45d1723b4446ba8def34ac8ef9c7837df
font_02_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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