Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc536e8633a127d…

MALICIOUS

PDF

82.7 KB Created: 2021-06-24 03:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b160d9f793781ee1a5dffbad729eaff5 SHA-1: c94b1d8cd116375203b142e461f415c454df663e SHA-256: 5cc536e8633a127d4dbcaba74d5d7b048639fbaf0caf20cc1bb761eaeae7d6ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, presenting a lure for a free chemistry dictionary download to entice users to click on external links. Several of these links point to compromised WordPress upload directories, indicating a potential distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://thepokewave.com/uploads/files/davaxidatazo.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/85750025733.pdfIn PDF document text
    • https://luminex.pl/upload/file/25105815094.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c2b9cdcdd2e15d90cb103427df505a94/rolukafelotejadufinivud.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50b508f8e---54412990315.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/240809113367.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jhcus0q4epl9e17t7to3hdfg2i/peminasiwebajokibofos.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/sagijobelinetedofapuza.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/46753378302.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cmljsav9pm1pv3mvpa30ot5iep/90268458134.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c5a51ac6---22245508023.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/dc2b5acb19942ab3605d0742b1c3c0b9/76394057985.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/viloved.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081479f2bb7d---14473270033.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b649c7159---55529137568.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a17df0388---baxibagolanixenup.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec27b4775c---limuzurew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=oxford+dictionary+of+chemistry+pdf+free+downloadPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001205e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1205E 18192 bytes
SHA-256: 2c3d1ef8b6e2e227770541031591f0feef9c3edbdb5362f9c2dd7eddb8487100
font_00_sfnt_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 7884 bytes
SHA-256: 3729f4ef9f0bc44546461d39927891238045db97278b27c311c2e0b3d0bcc00b
font_01_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 5684 bytes
SHA-256: 93e188bd8b3aa04b0b83140e106198d53e013d61efdb142b2581b82653485011
font_02_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 11180 bytes
SHA-256: f18ae059d81b4a5000ad7a4dbe76cfc21f7b1af03346a8d73ed46454093e30d2

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