Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb20320ad0d3ed3e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 07:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65cc809faa69a23d637bca476ff490c0 SHA-1: 42eb8234aa845650e22a0138ae98d9bbe866c2d9 SHA-256: fb20320ad0d3ed3efb314a6fbbded528ef7ee7fa4037b09ae41e63b933176250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous external URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=barefoot+bobs+beach+grill PDF link annotation
    • http://atomiccm.com/userfiles/files/zugovesazejeruxawadujabu.pdfIn PDF document text
    • http://farmina.ru/uploads/files/78899013099.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vugasa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/881e869d07f54955d47e321af5914839/gavudabifapi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0e56c9a67---36193933199.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/dbc7f72d5e7f276e532421b5cd015e5a/dutezefu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609219f1583e0---4906556902.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bofowuxabuv.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/43942439245.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/85827831692.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/46616599823.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cfae38078---66350115121.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/lovejiduwimaf.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070700003373499.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8pbp92d0lvua1l1of0543r2ma4/68453976698.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rbg7nucine695ds8g1ds6c5q54/xivodasipisawovik.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/xupum.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zadofofizasalosofam.pdfIn PDF document text
    • http://unsersohn.ch/images/file/25614069792.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b24cdd0a2---93891835904.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2dd553773---luzebon.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/tigefob.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16104644877381---pofuloperepekexaxasorikan.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/fekitiporitixir.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0507ef68abe6b54eb82cec63cb801df1/jerididadedipumegokoxima.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/zowosuravapenesuluro.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 17744 bytes
SHA-256: 16e9706a5b5a8c30528cc87128b29a184d0832c8d7f17c4b90df8906a5dd9aab
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10704 bytes
SHA-256: 3bc1ad817e7d0d91231198f0526c26aeda631fa26f588ca92bf13863f1e1b5fe
font_02_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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