Malicious PDF — malware analysis report

Static analysis result for SHA-256 3107d2a88326180b…

MALICIOUS

PDF

81.6 KB Created: 2021-07-03 16:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5c3bfedcbc9f0cf3f49cf895993d89b SHA-1: 9ee72cf443a2bdbd6b013fac23fe985c929721e7 SHA-256: 3107d2a88326180ba8c4532c4c2158a4e3c6726127f7d76710e9f19506552cf5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of numerous links to compromised CMS uploads indicates a probable phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=conversion+from+atm+to+torr
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160740b1f3a898---lizejanumenuwemin.pdf
    • http://school19-zav.ru/userfiles/file/ziwusosabafizifun.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/95913680369.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739305933e0---lowemuxorabinitixemedefal.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9c110bdc---81186664532.pdf
    • https://tolgyesvolgy.hu/userfiles/file/43468948108.pdf
    • http://cpghollywood.com/userfiles/files/watomikuxu.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3f4bc0497a69c16ee0d158a09c07e446/bazuwifetalav.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ad5ba54---15706922160.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63f72fac1---fozeromulis.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7432a24f---99590714712.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a16c68d5---38375251937.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d69efe78d93b8c868ed6fe467c7b77d1/bebev.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6752c9bc5---54679108173.pdf
    • http://co-wemart.com/careeruserfiles/file/47876300895.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d5e41d3b---78029478758.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751fdeb0099---41992530837.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a4fa8d38---33986484639.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1o5jn4sm4it6gdo9gl6tdidq70/92611013359.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10974b1d29---33789874982.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f74419a0b---rupox.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160802d3c391cf---92866018023.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8fese5p3l3ulqr0e4g93bq1tf5/26259679048.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4if0acjgpetufc89q438hj3pf0/xokubujovuxo.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c09cd96d---37559887958.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/965bkqc8qtgutkht70nni6boei/tifejojijuzejopofofiwe.pdf
    • 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_off0000db48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 16792 bytes
font_01_sfnt_off0000f35a.bin
7ed92d11e352cef12d929715f23642dbacccd890b9a495f8feeffa4534084c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 17512 bytes
font_02_sfnt_off00011fe9.bin
e70a3deb5fab27fec02f870c41dde65df811768b656c74f180eb76e94d915f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 10428 bytes

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