Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4944759b3ef9c2c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 07:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46d29574c1a819999ebe439705bdb4ac SHA-1: 3ccd4cb1b60827a5d4d508370759cab9854822d4 SHA-256: c4944759b3ef9c2c0ace5dcb41cb54d0e345186181ee1d9b961e5fef2f9b00c5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The primary attack pattern observed is the use of a link farm to distribute malicious or compromised links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://studioferrato.it/userfiles/files/66033569929.pdf In PDF document text
    • http://corporatiegids.nl/uploads/files/modutawafimazebomu.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/kapavebe.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3b31882302514eb0130529cdaaabcaa7/vavonugibonojofumo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/5414057106.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/betamumele.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/palafetosuziwakivegawi.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/43740145604.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109051208378078.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/nelevutefeku.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/13205906723.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/51575357786.pdfIn PDF document text
    • http://katela.net/userData/board/file/70651593231.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb1b9e5e1---60232368058.pdfIn PDF document text
    • http://iviltra.lt/images/files/lepezilafawulalaw.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/72958287256.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/71274787980.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913070655297719.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401768cc7b5---rabarifuwejofagivinu.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kosij.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/77869682291.pdfIn PDF document text
    • http://vtaky.sk/media/file/gopur.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/82516763672.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b133347760---jopawasipowefawezekeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fern+gametophyte+is+nutritionallyPDF 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_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 14244 bytes
SHA-256: d38c6705a97147889afb5426fa892b04968ad57af2c0b0644760b95db15c703d
font_01_sfnt_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 10892 bytes
SHA-256: db6b574ee05f227349e2909251a3882ad70c4d784449fa0e2eb9b053a0bcb6f9
font_02_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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