Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0722999828afa5…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 08:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c557badd3c2f69eb391f09c6b9e5049 SHA-1: e52d9226f151ec83b092a96ec0cca4f4962f990b SHA-256: 3d0722999828afa5b60b942822227400b1de7fc237b75c69cb66a1dd0a5a5cba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to lure users to potentially harmful content or exploit SEO vulnerabilities. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a841356673aac8543daf12a08397b6dc/92947759404.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608453ed6d760---48748117486.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b9335fef---lafagojofazo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0p7tcvc8dom36buc1c6ls7lce7/81466783129.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1q2agd6esrfntaerq6h3acnj44/badudegaselewemof.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/20035638981.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f38deca8d---6079758686.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c28331593---kajamogaruzumulasasog.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c4b0dbf22---55221851477.pdf
    • http://reicar.dk/userfiles/file/voniwugozisisizijusex.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/67513953183.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f0db1db3c89a2d7c3659f2899ecf0520/23968911690.pdf
    • http://ghioroiu.ro/sites/default/files/file/2581597340.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/13452962966094143e16cae.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dtlljksk5tpeej2ru6a2tfbom2/wokojegelisumonune.pdf
    • https://healthmatters.me/userfiles/file/92605639724.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1a77fda74769f8e90fc6ce57fe3b5926/midomigidokedupanetid.pdf
    • http://mkbeauty.vn/luutru/files/bafatibolitoxegoled.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/peof43ik5qsliv3ru2e2ttg0cc/34534173524.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/563ujeis9b0pec9tfq45nf1ne2/80906049173.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a426f6231538a86fb7a9ee4d627f338f/71767507055.pdf
    • http://altelaw.com/uploads/image/file/kozexi.pdf
    • http://stellamaris.cz/userfiles/nemilir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=crontab+run+command+as+root
    • 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_off000100ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16792 bytes
font_01_sfnt_off00011901.bin
dbe281005d550f7d706a9a4ecb2d6b224bd55e5eb057ba70348e5755713994e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 18368 bytes
font_02_sfnt_off00014a23.bin
d1b353358e9ace91c459636062e9b82e3a4c5000c11b2601c7ee592ee22f65ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A23 10532 bytes