Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a227f12abb73c2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 16:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce86bc3ae6bc61772b353d8ea6b246f0 SHA-1: b79c5f0d28464f4fc8e314e8d0aa2b57b5ff9ea4 SHA-256: 76a227f12abb73c267572c973a11f47773848d31712933ddb062c26cf609a318
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c11d88e29---wefez.pdf In PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/a78038ee5ad7b51e01921a1626cce391/2835447868.pdfIn PDF document text
    • http://geose.ru/userfiles/file/27031113671.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/zidokexanidelo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ae4ba1d7---vufezazekubirek.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/xipewobatojujeripanagiki.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaa314e072---74956887757.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16120730fbac15---1095499715.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6b40aea02be8dcf81f5379880f52813b/67718280815.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0955b1d04103ad67a7580fc3d6460b97/60456525450.pdfIn PDF document text
    • https://keongracun.org/contents/files/48404769690.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/95869464834.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/7442085473.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/titinugemufujewe.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f52282bfd2c---loroluwevogix.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/zimuzekosikebekive.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8b0a5459cb73ab149e9fa27ab4a854ea/fenanipas.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2635957392.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/migifijazunipanede.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/duxexudowujebewoda.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/28a2ac1c62e12e025f2dfd5e3dbd0369/jikemu.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/96795228781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+short+film+scripts+for+students+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_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10800 bytes
SHA-256: ebd36dd0f28dc1e392463e7aaa065a5e7f4e48568db84f49033580d09fd9c049
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 19964 bytes
SHA-256: 91a76c2f232de07765f3f0d795260484cfda3654b1344631fbd0871765d8ee82

Open this report in the interactive analyzer, or submit your own file for analysis.