Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f0b26385f1ae01…

MALICIOUS

PDF

84.7 KB Created: 2021-08-20 19:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43ec015df54bef02bd37e21d44499d28 SHA-1: 88aa769d43f825f3c2b879d8b279dc0c1fe1a29b SHA-256: 30f0b26385f1ae0124e0bd72bbfeec2ca95fb9d4dda9ce58dd51d690f8d3e030
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c305d64f590---40461905978.pdf In PDF document text
    • https://btsis.com/upload/ckfinder/files/gawakomawajedurorugid.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/dekukurefa.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/64841839902.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/filaludexavijarofute.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f10bf041---45218962935.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/juxeludanafot.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://artbynela.com/uploads/file/jizesezalejusupavipodones.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38edf019b6---65681861146.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/57535732646.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/madati.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607573d77adba---25509076683.pdfIn PDF document text
    • https://12shio1.com/contents//files/tulimoxafumorariwoselu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/135a3a9f92cbd54a1e256d8c050bfb14/jekasevow.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/wenogapejo.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/jatogakojonab.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea0194c77---givenitovawavuz.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fa0d00bdf70caff0141e9316c7e16b5/78807877285.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160756eb3c7456---27359331064.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/womimak.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c05576f54---67002717436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+album+de+antonio+aguilar+gratisPDF 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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 17980 bytes
SHA-256: 7f8851084ec9a6a012fd5afc4cd381e4483bb52735d7cba11b4e690d22ec2081
font_01_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 10956 bytes
SHA-256: dfa85cc34d8a2b1a9b9029851339274701d4c07ea92678255a1ae80e55ba7c75

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