Malicious PDF — malware analysis report

Static analysis result for SHA-256 6231039a6020d312…

MALICIOUS

PDF

87.6 KB Created: 2021-07-05 02:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1954b508d4b5c702756538d14525e34f SHA-1: 3177141de411ce028224420bd52117aba55f6134 SHA-256: 6231039a6020d312c96c5dc714f74b07220f816eb73fac32baf3940fccaef54c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01fa99f5a---gelanesixuzananupode.pdf, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://bdsvieclam.com/upload/files/kepuxavuvopukale.pdf In PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/2303f9285ea8ce748b678640dce037c2/nujil.pdfIn PDF document text
    • http://intergeored.com/upload/File/beduxisukanan.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb9c13353---53906068133.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/venolumodonakav.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6db8c1d1---50725144110.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/vawewotur.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01fa99f5a---gelanesixuzananupode.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/83830695732.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/5517d5fcb61ca308b9b5b7683ca153da/linivomeguzotuxuk.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/99cc6619e70e2b7aa1cce3aee9744779/jokolelezupinemovudus.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/maxokoferudimowuninet.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c37b6e6d5---lawirijopunutuvemajob.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b9652a2f3bc9fb532dfa87e0ac32ecc2/loxedalutubax.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0441484168---91291554800.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608d46b66f000---vesagamaxaxogak.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0c59694dba66bde4661f09ca380b2db8/vividig.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/tajopasanodexak.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160821de58608c---jamiridezatigiriluse.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/xuxusozoxorilikagozig.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/64153345136.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a7d7a752d7ccb61bf73d6649b0e79e36/23729825346.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/94543252641.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee620dc95501332b9cab843d91b77008/ziwuxizazekada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ex+of+conductionPDF 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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16632 bytes
SHA-256: ac48b8c9f01696dc95dbb90c13e92585e18c6bb8e5ce8fa6bf6aa4fa190ea542
font_01_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 10048 bytes
SHA-256: e809d64887db3232cdb89d00e73d5a21fab4a67fb8a21322b119bce34f24b1e8