Malicious PDF — malware analysis report

Static analysis result for SHA-256 a578b65e93957f3d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 04:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 678244e0163da5785d8e885b3d4508fd SHA-1: 7a64a7009ba924c819a697e2d9084d96ba6f2a4f SHA-256: a578b65e93957f3d603a1ad6429faa4176c61c2ae69cf740fefcda4048c344cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335382b6bf6---rojesug.pdf In PDF document text
    • http://galettedesrois.eu/userfiles/file/19181170648.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/putarasetabo.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kidufuxapodamowo.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/11163720844.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e94416c80495d5f0591dafb00838e9f/zefumopiri.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/bikefemazeka.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/mubutapuxarilefamaf.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nifasoruxigamoweveru.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137fecc82941---jobitefufegebagupur.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/4389297114.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/jegoso.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24581051020.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090413205773499.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/vogozeloma.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109062226153407.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/wusimunexuxukepog.pdfIn PDF document text
    • https://digireg.nz/upload/97006906311.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/felebizeb.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/95679381586.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/dozimubanetipinimalovav.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/35983340205.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxexijatem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=samsung+galaxy+photo+recovery+toolPDF 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_off0000b984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB984 11188 bytes
SHA-256: 3ce4d017c840109e0de7b9aeb7a2bc6b9f75137653c644b4b11bbe08a0beba37
font_01_sfnt_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 15860 bytes
SHA-256: 8797d695ee4196fc1c884fc4bcfb3a56b5598a91430d296bbdbbe879aab9b4b5
font_02_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1