Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e3618e0cd1a373…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 20:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802926eb819734808e478fd15b82db1d SHA-1: 998acd211631451e8638184239ab5558c79dadf4 SHA-256: 38e3618e0cd1a3732b4da36685333a178664179a863edb6ce8b021e1163fb993
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm for SEO poisoning or to host malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it is part of a larger network of compromised uploads. While no scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to potentially malicious sites, possibly exploiting vulnerabilities or delivering further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c9ac2612266a9d36ca0c5dd25bbfc43/dilepujuxexavevexapizum.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/relevofanagobenufo.pdf
    • https://valve-toho.com/userfiles/file/33870148504.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b41f162a2---vukuxafeperorat.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bf6e121d57762ade51aee6ba843709ac/lemuruno.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c4aqp3s87k2kg12hls38csvbub/wotivorazojemaxilel.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7d2f5134d5f1e198664e2ae37aa05a8b/42095152146.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7aad7731---41882798610.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/tugoxeduduripomobewewo.pdf
    • http://erex.hu/upload/file/16486967817.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105161350351361.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744653811d9---zamaxazeroz.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d7d40f1f21ac7d914a62230b62b0db87/52248648277.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/78107042857.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072300da99e9---96808556321.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/kiwad.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b515600c436---kesugimokozodolidilepudow.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7qaf0meel47n8fv6efk7k19nv6/roziw.pdf
    • http://noithattamphuong.com/upload/files/84926119331.pdf
    • http://forspeed.cz/ckfinder/userfiles/files/kenevozosijon.pdf
    • http://maasmartcity.com/userfiles/file/bilolakelirogeke.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc38d60c8---gabupupegekux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=stick+fight+the+game+hack+apk
    • 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_off0000ec2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 16792 bytes
font_01_sfnt_off00010444.bin
b4d458918824bb6092867406fde62f45cda58ed5e3d7441a42131ad1dd302b67
pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 10556 bytes
font_02_sfnt_off00011c66.bin
eb6f31b6418159df5e3b3831855c9396c43bd0979331b831f311f71f2891e559
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 19292 bytes