Malicious PDF — malware analysis report

Static analysis result for SHA-256 3522355fd1ccaf54…

MALICIOUS

PDF

82.2 KB Created: 2021-08-23 11:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b66e3dcda221488044c886252892721 SHA-1: a999a7c74185947bc9daeb9c8d3c91b0d00ce7ca SHA-256: 3522355fd1ccaf547781b84d0e64a9ad88e0b1a6214f62504db73fdf5f87e588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=unpaid+leave+letter+to+employer PDF link annotation
    • http://grawerlik.pl/userfiles/file/88297005582.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c25c60de0c510bc521214ef055a30111/vewofir.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/83636491977.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/79614530167.pdfIn PDF document text
    • http://strandedtattoo.com/file/64457115369.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/90665597086.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5dafipvestgunqr1urchmve475/23549887508.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pujevef.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/68219812096.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/l6nbhqjroa36q5d1o21fkhf0fc/83011302598.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/gevonofum.pdfIn PDF document text
    • http://vina2002.com/uploads/files/89217430356.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd1712198116e3d0f550a5e5948ae47b/larodupibawo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f349dc6f52---81710243051.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/bogimirewumejizigukezeli.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c1d2d9ca---kuvomuwapig.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/55316109675.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/mopibifukefetem.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bffb61cdb---zodedisifotoxinaxadixuvo.pdfIn PDF document text
    • https://o-dance.com/upload/files/tunoxuniviguzesowidagoke.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/dirutudime.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160962c770cfb5---roxusuribibig.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/64845901236.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dc71bf45b91f8ca1943bc4c5e8b7aa5f/74740544720.pdfIn PDF document text
    • 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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 10572 bytes
SHA-256: d7df18da501bb152916b27ba7ce644ebc8f2e9555eaac84296c29166c37e4569
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 16892 bytes
SHA-256: 4a9a20180546e31265719608221038a4b8115d3e3091b1e680c8e33406c6e812
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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