Malicious PDF — malware analysis report

Static analysis result for SHA-256 937a3d9f300bf008…

MALICIOUS

PDF

90.1 KB Created: 2021-09-10 14:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c097637ca22970fd5f654831342a185f SHA-1: ec55ff87bb38ea5611fc9c020b2d04cf25d865c2 SHA-256: 937a3d9f300bf0089627512a3b0d9a3f9cd8470dbdc6a58320ffdedef1f5f6a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161358ed7504de---42652960028.pdf In PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/taxujogewapoxuvuje.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/16674432394.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-5/20210905054715137497.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/55853736642.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/71463646725.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-02-10-34-46-mk94fbBE.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/rorewerovasumuluviretu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/145c72afbdb70bb2014819d71c015353/27908227119.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/difogada.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/98426993028.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348688ced4a---44251385483.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/diterosam.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/kubumojosujizatedesatido.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vkeolbl31imvcqc2n437ct2sg0/mosakaji.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34992414c---68531096970.pdfIn PDF document text
    • http://zae.me/datafiles/file/nimilokinuriv.pdfIn PDF document text
    • http://datcat.vn/2018/file/sesodel.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/3122305550.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/54456530076.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/93203585749.pdfIn PDF document text
    • http://hongdacable.com/d/files/jabamumovok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=into+the+dead+2+mod+moneyPDF 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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10292 bytes
SHA-256: 87f724404e999aec280372a0cc61a8913abfd6b820b87f492bcdb86b7576389f
font_02_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 18484 bytes
SHA-256: f053e57e1d1d80744202bd2586288fdb03ec34c05161c4f8289991ee65d3e9ef

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