Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e2d36c57604a92…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 06:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fdfb8356b47aff6db71954d57cd3bb20 SHA-1: c3d8893cd41875b7a24e2d8efd0d6b5769f5249d SHA-256: a5e2d36c57604a92d48b8571589dbf0352cb8a0a3bdd2cc740e216e2bed9f7fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, as suggested by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73142d381e---vivusapitabudixakodok.pdf In PDF document text
    • https://aquaprosmart.com/userfiles/files/25529379470.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/aabe5f27b1e63491f2d2107216508ad7.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/nujovas.pdfIn PDF document text
    • https://dietacud.eu/upload/file/33910355702.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa99328d0f---rigifuroz.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0dfeb751---vuwuxezamukagujola.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16092a57622ac0---70351849074.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/wiwiburelazujideno.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/38g7cm7qjm43sfmhkct03subi3/mejadowesaxabute.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d62f35e1b---fuviwumajigenakugamazulan.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zikejiwebomaveperel.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c524de2ddee---galuvovatoxivunulala.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c759ce973c9---valalufilukarobegenas.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/goxalolowowesanar.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e849b732---bitoxevasirelobuv.pdfIn PDF document text
    • http://azizolace.cz/images/file/69553288037.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210616141248.pdfIn PDF document text
    • http://staropolski.net/Upload/file/mofufuwek.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22dad21c9---kalagajijasavopodefune.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073822551311---19316799455.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0b33bd3a---50744575668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=special+ops+fitness+training+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0b32eaf9cf398c4509279fffdf2edc3a/wegutisumituzazuxobuwiji.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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 17616 bytes
SHA-256: fac53ed9c5afb105a7e7cd23fffabbfc19af6762b5925fdfae1ffcbec41aad9b
font_01_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 10868 bytes
SHA-256: 6c102aec76e140cf2acb70a5cb4317effb23afbd0eeba691fac74a06b06c83fb

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