Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba850e55c38ea77…

MALICIOUS

PDF

112.3 KB Created: 2021-09-04 22:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 699a403ed1c324c3c78ec4c592535e74 SHA-1: 7c9148a4b78d58e9fd014ae608a05340a736cc18 SHA-256: 1ba850e55c38ea7783d5322fb55525a046443cdcd2bfb0179aece3392c2a6dec
96 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, including WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests an attempt to distribute malicious files or redirect users to phishing sites. No scripts were extracted, but the overall structure points to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://cerescommoditiesltd.com/Images_upload/files/lakamiwowovizuf.pdf In PDF document text
    • https://belhasasecurity.com/userfiles/file/26684692630.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fac2b9068a8ac7feb332309329db298d/97857150687.pdfIn PDF document text
    • http://www.bash.cl/media/file/29969416180.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160911f141edde---kunozi.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/37097507227.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/dajiwizodimawe.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/savodipixir.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/66939379275.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnbedejb6bckuvbelpqbbpjqnh/71262853918.pdfIn PDF document text
    • https://melz-feu.ru/upload/funilipubividanoxofu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/47849209719.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/37655838157.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b674f457---90740339100.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/72520325848.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733a35cc765---6352137803.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ajkmq13mot3g24fd38idvdubm7/27168824236.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6dc9f0a3c68e0d9f36e38c5b3eb4ef55/xuwikavuw.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607000e40e34f---9876520055.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/seban.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/pebogopodoxazureluri.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ciu3cl3ifh2re7l9poqqak7fo4/gavulubevaxokidewogewu.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/89267937121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kali+stick+drills+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEB 19948 bytes
SHA-256: 3d6b88dd30e49bea56e781dfd35a2e7747a2707e3ab8d6d7f87946644587b3d7
font_01_sfnt_off0001839d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1839D 10340 bytes
SHA-256: 555e5772d83f682b579b8d1b76ac060f1e3ff88be0316aad85b023cce82a75fc
font_02_sfnt_off00019b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1