Malicious PDF — malware analysis report

Static analysis result for SHA-256 027943f2619eebe9…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 07:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9623412b8d84ffa2686c33039e76687b SHA-1: bf2549a98f1868e18692159a9b56dafac1e9d9c7 SHA-256: 027943f2619eebe9806bfda5b8a5a7937bfd0a75c3de9b6b54f1e2af96b44b19
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a phishing or redirection attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users through a malicious attachment to a site that hosts further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f1aad5f8c---98341316033.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ol4pukuev5ifalhp9ml44fs791/50759097832.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/78316327207.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/707b98af760e9851ce0e61237f59aa2f/bapaxitilinuxomosesira.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/16851854618.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccff88f4a---vuxek.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/8972116850.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/zajurizogitigut.pdfIn PDF document text
    • http://kfbi.ru/content/file/10522094206.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/63162550279.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/65128623595.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/lexaxexarepozixator.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bd7de8b89ee9564a95938171a212fc38/44280416103.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/96354446203.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///29932635503.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/82199246667.pdfIn PDF document text
    • http://ctm.it/userfiles/file/mizexufi.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/sabivowabixigibugo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fa956a5264c4cc0d09c10b95df578cc0/95386185185.pdfIn PDF document text
    • http://poliinc.com/upload/files/zabanedotovipekika.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/n7ovmg71f1ipavo609cd8vijs4/xewifozuxadoxagutenem.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fevumipu.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///lofoziwob.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/lodojusopoxidegapunubox.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ea2080ce---midafos.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/40acd65c684ec12694eb6dac918af753/jimubumosojaja.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/99179191063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=carica+papaya+leaves+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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10500 bytes
SHA-256: 41c65628cddea4e3a594d0d640a69af3430df8ee51e470ea4b245bdafb07a1de
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 17800 bytes
SHA-256: 45de8a7685f42b4dac1293fc2452b49152102e416e651429672e5a31a482d090

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