Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a51b80b75519bb8…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 19:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a5fc9f2912003def651c3ae3ea2f4559 SHA-1: 629f138402bcfa7347a7d2f426a4d61f554d2b56 SHA-256: 8a51b80b75519bb8b8f762b8418aaa0cdcc0657e137a032a2d052ea33e780bad
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links, many of which point to compromised websites or disposable hosting. The heuristics indicate a brand-impersonation credential phishing lure, specifically impersonating Facebook. The embedded JavaScript likely serves to facilitate the redirection to the phishing site or potentially download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=year+8+vocabulary+words.
  • 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://neonyazilim.com/images/Media/files/muvexumugezibefegibufim.pdf In PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210602154006604343o73s6k.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/50756076082.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/bazanivemidopimopematuv.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160915778bc8a9---33298276331.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac272b2277---sumibotumederufureku.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/vunefenaritazunin.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b19ccd238---18160647329.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b22edc1c5---89402102284.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/l3tkt3mojshcvohnt6v52njup4/nejepajasibilalamugufidi.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/gumatar.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zofixojoli.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/55253302821.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/kupinugurifema.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/55fe4b6935ddc58a8548cc8639cebcff/72517334971.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/gutubutefolakif.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091306842f33---ludofadoxemutekudirawu.pdfIn PDF document text
    • https://digireg.cz/upload/rusule.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/vonokarorukadiket.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee596037dd---7098720176.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lejara.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/2183687534.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1d257e6e---nesafuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=year+8+vocabulary+wordsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/198a0cb2de5ca73e07cad317d7d7a0a5/tikukuw.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 17100 bytes
SHA-256: 018f16ddd8608798f1b5986a8d221b0a37b370d6ae6aa95b13369e39b0b09076
font_01_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 10764 bytes
SHA-256: a27f2a052eceaa5d6ddead3768f542358d5be2b0d91d34c0950dd5948aaca1e5
font_02_sfnt_off00013be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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