Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5be636245f1811…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 02:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2822f869366b59e0ebeca5dc19c8e08c SHA-1: b1fcc2057b608f0858fcd2fef3c18878adba4dd7 SHA-256: de5be636245f18113087e6dcaaa990e2b2d01bd77ab899423bfdafb92b46132b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jrmhandling.nl/upload/file/31490862604.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e1ec49a21bbe428e9f6d9dc8f375a7a3/77988689608.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6dc5f4f2592bec64796419272823b6a/76070729028.pdf
    • https://cpsguffanti.com/uploads/file/91461413630.pdf
    • https://thediamangroup.com/_images/files/49168904379.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6a381e4e70301bc84e3d17d29498a572/31906981901.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5d1985a6---komupumabazazuvanufurudim.pdf
    • https://mauspro.net/upload/files/22669671980.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/72044779153.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609283a79b45c---zudajumifiwiwezenuket.pdf
    • https://talleresimad.com/images/subidas/files/dibukekemuz.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6ec24aec7df1ff6b8e0320c3ca862c5e/99729977934.pdf
    • http://www.dereformasenalicante.com/archivos/files/geduxapojufosakaluvan.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/minuxonoweboru.pdf
    • http://www.asap-recruitment.net/upload/file/76393643655.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/edd2814d041e6285d058f1f63e1ef327/97315007452.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4d0a2884---88521697677.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa79b8924---93158181149.pdf
    • http://appletechsolutions.com/userfiles/file/vatep.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0daf34c17---zevesazesi.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/76fba1a4f6c5a95a681397b35aaa90f6/ledalofeziwijadateb.pdf
    • https://puppometalli.eu/file/xapowusogukuludezozo.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf4904c95---82697034036.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=deforestation+causes+pollution
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e485.bin
23afdee1e997f659775098e9102faa634aec5af57f7d1e617b5905e853343f75
pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 16764 bytes
font_01_sfnt_off00011020.bin
95b3abb75a95857967925db9ca2512e7f93a59a3937ea5b0547f014e130dede1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 10576 bytes
font_02_sfnt_off0001286b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 16792 bytes