Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99c5047dd30e6b5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 18:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7a7512bed5d62874df0a8a323f5c711 SHA-1: ee034ebfadde1dd82c3d34956b3d1c0d71b73b09 SHA-256: d99c5047dd30e6b512e3cf4e69dd05977dc680e872edcb15eb20864888e0e911
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://smidgel.ru/uplcv?utm_term=marathi+ebooks+free PDF link annotation
    • https://pypconsultores.mx/userfiles/file/named.pdfIn PDF document text
    • http://orderkai.com/uploads/files/75070101877.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/mosepak.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/xoxewurazu.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/80176134496.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/51161375799.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138c14fe6b6d---61081795677.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/926919210.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/88504932558.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/29d561379ea7d35651e0facef03f23ce/sawareseganivi.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/batosudejanowe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a411153b0e7ba779bb58694fb42514a0/befefesiremeza.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/70516867651.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/ximer.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/15073546144.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/37c16ab130b1b66be9e1d069b5a73b9a/53719631588.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/tewaxobilimiturik.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/28661438815.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/9935605831.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55213232726.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/baxosogo.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/widifobepuzi.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/15215194601.pdfIn PDF document text
    • http://sungder.com/upload/wekimemasetemepejeduj.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/44098916355.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_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 10388 bytes
SHA-256: 128fc74c2e1852a65795952773c495167c9095662453ba376f7159cacf5e64c1
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 17236 bytes
SHA-256: 63ebe6ee71c420dd4020b915d9428228ec5dba916a1e883f62b9c84a716bbcd5
font_02_sfnt_off00011921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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