Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc90cd55c66e391…

MALICIOUS

PDF

104.3 KB Created: 2021-07-03 08:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 306c9c819e089aadd389b29525c8559d SHA-1: bb4c2a3c0cbc87ffe909324661c7d84b04a5271c SHA-256: cdc90cd55c66e391115f36c42d00fba574db2cf8cf2845632efca1f5347d9ca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links hosted on compromised WordPress sites, suggesting a link farm designed to obscure the final destination. While no scripts were directly extracted, the presence of these links and the overall detection profile strongly indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c1445474---zaruwepijefoworiba.pdf In PDF document text
    • http://wowbond.com/upload/Fckeditor/file/70657486478.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84bca98ca---38632955698.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dm693f4u1ppk6cqloa712pj513/90940847817.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/11419905987.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/zinedusezotakovitu.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/81913217601.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a758c1ce96e---50912719995.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8b2ddb5e96bb2876277a9eb93f83a47f/3118168099.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae63712ac---579314811.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b173b3907---19704808503.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607023face1f7---woxolunibivazujobixari.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/bawezida.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082475473dc8---wuxukuruwiwitufidemore.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ff378f8dfaa4dc705675293d0c37d38d/kopabumimo.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/zavuruje.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c900f457092---13232931711.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2e7736fae63014aa2de63ca66e2bb442/vefifulusiba.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/13094633169.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cf20beb1---mobipovezakev.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1d135985e8afc133444c5ea7ca0d97f9/76519057556.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/63596710266.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9a2e7232696e14703e44a56dd86c3460/dujupevun.pdfIn PDF document text
    • https://ecoretras.com/file/jexovereludagikafofixobop.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/6616089921.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f26e036a---radutumovimojovized.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+clean+hp+printheads+manuallyPDF 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_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 18164 bytes
SHA-256: 2a4150f830d0f41c1eedc7f36114decd8722541a8c01e9a69ec8d64e9447eba8
font_02_sfnt_off000179ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179EE 11072 bytes
SHA-256: c9958366edd1c99a7b68c17774c38758bd332b67f48136b36ac95c7ccd80f1fb

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