Malicious PDF — malware analysis report

Static analysis result for SHA-256 a447abbae4dc3dfc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 10:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ef7d80a066d16531607187c48510ec8 SHA-1: 5a893ec2153b61437dfbf1585a7297a6a476ddd1 SHA-256: a447abbae4dc3dfc83d59de66c7ad9ba73f899b8ab5fe1ee87f81c2e95f490bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=food+safety+and+quality+management+systems+pdf PDF link annotation
    • http://waterreducer.cn/d/files/44665725027.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/67453333446.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b43c3d061---30363900558.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d83c365b972d394b6c520e34b626371e/jotogazinovojavilo.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/21810742672.pdfIn PDF document text
    • https://scalper.ir/data/files/file/98240709395.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a1h3g9m0ulcdeiugl03gikodm4/zabogojowuvig.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/naxafi.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/gowuvizozeg.pdfIn PDF document text
    • http://www.buildonhope.org/file/kedabegiruragevurifelelo.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/48180610030.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/lapugegoxemudepiwalil.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/12019459077.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e278ef56410---6269236943.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/11268035759.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/11098438293.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/moniladeroragodukukofapek.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33a10f3411---31066739551.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad6b0e4528---77584217530.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/kosuxogudugapodogu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902e037eef9---kinesedinivalubaromoduraw.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e6c00081---89849281266.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a6ad12152---87319692313.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/79555265783.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_off0000bdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD0 11076 bytes
SHA-256: abbbee02eca164da9098c295dbce1f5a08a696a715aa4ff18d3ff7b905b00bab
font_01_sfnt_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 14968 bytes
SHA-256: 47cd5c68efe58a9960eea1857039ff882e311858388330a2d7e62e82160fbd38

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