Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a4c48eeff1db5d…

MALICIOUS

PDF

94.4 KB Created: 2021-07-03 02:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffa652628231af4bcf019c148a04435c SHA-1: 2ad5faac283ab6f46c37088448a92571e1ad31fe SHA-256: a1a4c48eeff1db5de4e0d346db6322f71a317f2fdfb892eaacadcd3a3862311b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, including WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://tahubunting1.com/contents//files/87173638898.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7fe50256---ruvojogabupefofijo.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/au5up5qocl291qe4dq1rpq3nmo/negepajafabatigun.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085cae37f261---71324513552.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/10177afb71b70f67aa4f67175bfee821/pagulajojumobuziza.pdf
    • https://hchoanglong.vn/userfiles/file/58356731634.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cbc1a199---notupulafimuwatob.pdf
    • https://angkorphotographyguide.com/userfiles/file/pijimevevagam.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97d035e6b---52335353569.pdf
    • http://biosite.ru/images/news/file/24731431160.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d892d3937---mofofetirurawijadil.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafa899344---xezokugalit.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e52a547dc---86315427062.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/09218027015f8eb4e1b4dcefa0bf863d/reniwifotezolumodegifop.pdf
    • http://mabifitness.it/userfiles/files/80210082914.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7r80uanp4jmpjtqp8u105t2ba0/lurexusegasumelokuv.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97372171952.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070efa55b624---70728929729.pdf
    • http://quadocdao.vn/uploads/files/bibikovupo.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5ba23611b857e9d26042de93cc1ad9dd/97098498781.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k7h53lr39m4r6gvkj42mnir061/jogej.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/56d04d27ed7b061656860b447fc2d2f1/lekotefebovowefuwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tailoring+and+enchanting+guide
    • 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_off00011187.bin
bd5f29a7d4bf591b08b5d0e9798eeb02a87aee7c4fe63e91eb66d54c4c3c36a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 10544 bytes
font_01_sfnt_off00012947.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 16792 bytes
font_02_sfnt_off00014159.bin
46093e51a1b2130d3177ce14510f1e0e8eadd4ced335bf63cb2b83c89e0776fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14159 16576 bytes