Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7acdca70388fd0…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 21:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d645c8885e61ace036fe7463e8a60cc SHA-1: e19ac2bcd618ee8f75e2d542636ac475f2c7916a SHA-256: 5c7acdca70388fd0c52aa100ba01fa682b7f5e1aafc60acaa79d031650784774
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 uploads and disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an intent to lure users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/buis7t4842uvpco7o6pptat9k6/30239119003.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f7b91c9d---gijapizarorigapazas.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b106fac39b---momatelumo.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/68436649801.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/54963169249.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/11542229992.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f041b124cb---65789126935.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/jisixexazi.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/45686571936.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/9674923419.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/14003819481.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/pifasepewo.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/21555553593.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/16488137464.pdfIn PDF document text
    • http://facades-et-traditions.com/actualites/file/31963736275.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa47ae17544---lexafoge.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/subiletunarini.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/jodajaverurot.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2ci0h9l9pbkupk8stielbrm1r1/91697796468.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/42885237731.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/tenonukoloxatoxek.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/12058992775.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/linoge.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/rijirinekibixim.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112f41b9d020---warazijejegidojudadif.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/24504462716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=helmholtz+resonator+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_off0000b9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 10720 bytes
SHA-256: b0380dcc62009b242704f2a17f219ac06c42510d59209fa6e1b1e02f3aa7ab34
font_01_sfnt_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 17232 bytes
SHA-256: cdf4e0a8506a745b45281414b7c42be27d002bd5f1d72f74b463e3ef0ff68c41
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1