Malicious PDF — malware analysis report

Static analysis result for SHA-256 576cad3742e44753…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 14:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0a6200e374a959c72de2bc99d82d697 SHA-1: 1a4095fd8a336938d0a9c7355b8a0d7256b3b9aa SHA-256: 576cad3742e44753bef3dec1542553185ce7015ebbdd19590ef05a6928e5c2cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The presence of numerous external URIs suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://boissee.fr/userfiles/file/zibejedejoradofazutem.pdf In PDF document text
    • http://rollfactorytogo.com/uploads/files/rolakelalomoju.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/kinuxi.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/dudolusum.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/mibib.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4284678a5047a9287c7562415c40cdcf/15224273598.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/fekopijulura.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42259ada3---najedejaziferavigebosomof.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/kabupigadekuxuvikafip.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8a29ba8085a2ebf2c5ca8855d1eee2b4/72208804217.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2adf13c3e3---vidamijepenano.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b19778170---fetejemizak.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/91962170677.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a69ba214---50926452700.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/9607942405.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/rumive.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16237793451662060936.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/15232130808.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdcfe4df38---mafuwi.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/woxodoxolubitopowu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b18f22b7dfbd9b8539941cfe00cb7385/4845484264.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0aaab570---15450826237.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/fomusen.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kimuxup.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/52514464fc7d6b678b5fa07fbbfb688a/rodiviwegogurorelot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=discuss+the+history+of+money+pdfPDF 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_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 18484 bytes
SHA-256: faa7944a87aecd1745bbd3bfc5d2df4e7704331b79880b32bd37690c390f2cef
font_01_sfnt_off000131e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E3 10892 bytes
SHA-256: b40197ea81b601e960bf45f5dbbfebd12bf310cf2eec951128fae35107d3d24a
font_02_sfnt_off00014afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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