Malicious PDF — malware analysis report

Static analysis result for SHA-256 902aef51261451a1…

MALICIOUS

PDF

138.5 KB Created: 2021-06-21 14:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8945c2fb2d6478dc37d6019d71a100f4 SHA-1: e6ab5e081af6a8a1ebf17d5f0a99fc9076a3745a SHA-256: 902aef51261451a16636637dd72013b9af412358e0502a6f2fde66424c4ed284
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://stlnsk.ru/uploads/file/fafajepobufofujazasotuma.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/975d140f111799f59ed74d8f9bfc3815/66887198758.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/firajudemoxaxo.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/vemopemo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a128298bc60---77676319754.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb2737da1---mojene.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/75499f51a0d7bbf5826f3fdc7326539d/93633930169.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb18d28585a---61669970116.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/betexuf.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/83239702702.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4ba485ce7d5c822b7b79894a3492707c/muxilefuwiwosuginivowim.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/60513748545.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/bewiwakenujis.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/gojojan.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/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=super+companion+made+easy+10th+english+pdf+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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAD4 6060 bytes
SHA-256: f53bd5f0bb3b6860bfb2d7d0926e9f12e9014e01bfadfd6ffb6838277f659356
font_01_sfnt_off0001bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF27 6444 bytes
SHA-256: 45d57c5a634ae81e2e2351c2cf657cea7b0a0a2bb7c0e5eef4067fead371663f
font_02_sfnt_off0001cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF37 18124 bytes
SHA-256: 54c0598179c1ffd49176663cba66d577c4a73a832e2bcc5d7fee63b891c72671
font_03_sfnt_off00020590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20590 16420 bytes
SHA-256: b4c5518340586104b383194e5927bf6a664d15f89a2d094c6373dc7b4cc52c00