Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f830f7f6a4af6e7…

MALICIOUS

PDF

79.0 KB Created: 2021-05-28 18:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3f045dc67d3731538bf6e2330db34766 SHA-1: 0678617ef1a16830aa7cf724cb29b4a07c316138 SHA-256: 1f830f7f6a4af6e7e8904871315c37b4ad8fe8dca9e97be0d185c6e41eea7370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised CMS upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930d1e713c3---17375779158.pdf In PDF document text
    • http://bagiez.com/userfiles/file/1388685152.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/52567872251.pdfIn PDF document text
    • https://amblamy.ee/upload/file/84415955243.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c34440948b5a614f0efa59035e9d8883/11802679539.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/42582102457.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f087d7519493d6986b54d2242c237198/bamibawejavanulesufatin.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160accb935868e---21247068407.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/monobizigezenixa.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nakiwukewo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d3dc7039---butinumadux.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01bb1ca14---lubimoxarop.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/xitoxukorubotubixuxedi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43cc9fe0ca594ca1a9eccacbdc410a6c/99992464795.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ac8795cb7877b327ed8c539bd76080c0/31719245008.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/41967527837.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8242d351e---fegudikozurujope.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8798f9d2ca---18782033137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+the+characteristics+of+group+2+on+the+periodic+tablePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 5584 bytes
SHA-256: 5d7076769cab19d0c5f139f308afdf1aaf377394dd556752ee27bcdfd9b05092
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10428 bytes
SHA-256: dfe6ff5a830e33728bc90bf3b3f417f830b41e2e8af9b327d22f882669efc866
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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