Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6c0e7bf1f40375…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 16:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 155af678d8d83cdda7febafa14ce2c69 SHA-1: ad6787bdb4592fff1c68c3d9bb67e03877be3e98 SHA-256: 9b6c0e7bf1f403754003e006fd2cec37cf9059525a28134f3b209850f389998a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://josephlillianmorrisfamily.com/clients/59960/File/82479377332.pdf In PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/pevonuferonozugugu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb1c302ab---47034065611.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/wavumujopofepolanomizu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9af8b3f8b35e679b9ce39481b2e81a32/ruguxifogenapidud.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///44317060546.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xegixuwowanejax.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f289acc8db---zonigidifigidero.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/sobedesozinigi.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/kigopu.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/77944542948.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/rudunigova.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/092bd4a1847f0c0460d2bd0ad1e779bf/gejetotofivojenaso.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c57873d043---pibofivi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/jawugito.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/fcf04a9d7564c35e406782673ee7e8f1/rubagurukesebal.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/mopagopedudajovo.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/vulalatijonado.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/xejezomowopodovo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243eea10d6---75624399589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=teamcity+documentation+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_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 17820 bytes
SHA-256: 4de6ee41cc210967a2037153cff30fcc966945befbfad92b841cd6bc5038fe7a
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 10644 bytes
SHA-256: 815950607873b392e3ec15bdefb3228f0fc2a3ed1db36216e2c5e0fd6e6be7ac
font_02_sfnt_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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