Malicious PDF — malware analysis report

Static analysis result for SHA-256 99683698f2987435…

MALICIOUS

PDF

94.1 KB Created: 2021-09-02 22:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f245fe8872f22308850ffcafb0dc9d61 SHA-1: 1cdeefd5aa4820d719a692b49ff278768d280e5e SHA-256: 99683698f2987435cfc870ca4afb79637f3846c37ab38a3fa98138a8357764db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a malicious payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=international+relations+by+pavneet+singh+pdf+download PDF link annotation
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/99789b39988bf533639c7dfee2397623/gebuxujuvixadoporedamol.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90961ffcd---52243211978.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/lixif.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/gogarax.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/rojikiketowarekurud.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bb9e3230c9bf92bc401ee83f6e71fd59/tugenojejimuxotade.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8720cf22ec---19154355311.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a036cc4fda---15040841961.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcf9164e063f68db7e38fb1936cefca1/libetofetozaf.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7878f28ad---tubutabegun.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/zoluxepoza.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/mutofapupanikuwu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/93595941840.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/krbv2onl00nju6cd3j2gdnsnk0/50692551870.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f53f1947---lonugemudidaragalike.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/39224068654.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebb777fad---kufijej.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16246368111361.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/kaxin.pdfIn PDF document text
    • http://hkacca.com/userfiles/sejapawabukakate.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607728312c47b---rimekewisopozi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/5477732135.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f7950b73---tokevasuxaler.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/67546327676.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_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 21280 bytes
SHA-256: f67b174a6c454f7d8a2776f923f5e70346f2c7d23ed9a515db07e63059ef98eb
font_02_sfnt_off00015078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15078 11132 bytes
SHA-256: c72cebe8b785eded55885a63596adf863ccacf369b04c426b9930b8f06f2a68d

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