Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5f78d1e11a3d10…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 20:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3661c0dc70cc8ce3d9acac70afeed5fe SHA-1: fb1f699b1424988e084a83a99dc71684e7ff53a2 SHA-256: 2d5f78d1e11a3d10d4c68c9d9640126015b76dd94d7851741f97d8008ac595d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to lure victims to potentially harmful sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b50dd8ecf---litarelit.pdf In PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ccaafe16804f5a9b0ee6313686968c5f/kerosawonikadamexe.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/figigazivu.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/64726795836.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d919c7d1---zomegaw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62ea7b2ab---minisa.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/xabimaxoguku.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b08f3033b---67776981380.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/70342562104.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fb0i0tvgcsdfa0f52ghufjsqkr/33075600213.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/lpoon9ua764geo4jddte7s9a77/2108625453.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/devinesenijekamofejewuma.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f756b8abfc08d0fd81ed6efea010d268/17375733953.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16088b62c0c7af---xebatubidujenogevofudimu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/r50ajm393idj7bn78bu6udqho1/89496920987.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1aac10ec7---xesiwufedeniwonumi.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/43842811119.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/309168a27b3f68f945bee33916e681b6/96509080153.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cdde5f3bf---munasolonixe.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d8a6ec242---dixukasoboxuw.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/domobofo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160706c8902e99---67911870884.pdfPDF link annotation
    • http://www.minaakshimajumdar.com/fckimages/file/bigureretoga.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210701015732.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/jukad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cheilitis+treatment+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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10676 bytes
SHA-256: ac89a296c541b6b593b3e303c0506f1b246494f2ba5b4ed140f8aac7aa29c757
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 17500 bytes
SHA-256: 6c84e056ba8c01361ad06c818bc5408c29f7c8b77bdadf374c0e3f4ad7ddfc62

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