Malicious PDF — malware analysis report

Static analysis result for SHA-256 c583bca45bae68f5…

MALICIOUS

PDF

93.6 KB Created: 2021-06-27 16:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddb85bc3c9de63a3d0ad1e4803d0c654 SHA-1: 916bd9bc21ca67571c9e05b4a423fd4bc3084552 SHA-256: c583bca45bae68f5fa4af457dabfda81dd7381846e34fe9f7336725472ede684
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the redirection or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d84ebc058---66642636229.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2bf524866abea3df35700f1a4a2d9166/23349596976.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d835813f---38074420593.pdf
    • http://rhondachem.com/d/files/8072072757.pdf
    • http://www.asslar.de/downloads/dorilisumiwixi.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a45d722a410e866109101cbe54e83a88/9671414242.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/5oumelfb9o8ijbpgsfp2j0rlcf/zubesabasimos.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607943c9c0160---19492269022.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f340cc4a---worabuxezowen.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/50c78f9fb71917da8993ba3e1ef3f868/veluwawowufako.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/f6elgdsr1u1d3aes0qbqlb469g/85406441954.pdf
    • http://intertexmedical.com/userfiles/files/54566704356.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/16220627472.pdf
    • http://ameshamagazine.com/js/upload/files/tomaxavewofop.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8f6406344479c0daacbf5f6024e546a1/36592520573.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac073644d23---97371841226.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608886979c7cb---11243492230.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c4b8d15110e59f57f69b29a318bbb991/napipuxeneselowekapogupo.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d827908a3---lavolakuto.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5386e6e39---69058591839.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160973c1bca3f1---memux.pdf
    • https://ratsimae.eemedia/contents/file/99644898075.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f5f1d528e380fa3ea4c34afc9c2f317/53269608344.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ljle8dqs6ikt7t2teniautl5or/80949852009.pdf
    • http://www.derbysignandgraphics.com/uploads/file/nofetixipapomafoveleg.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c123bd2c947---xonadikilugewoxefunafasuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=spiced+rum+toddy
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 16792 bytes
font_01_sfnt_off000109f4.bin
1a8f05648d7cc9c8a050ab414fb71bc2d268013fe464eaafcb4c19024980d0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 18232 bytes
font_02_sfnt_off00013a2b.bin
b36b5e24446797660557fc302404730bb7d825b76ccb8817c4a9f4c4b4ee71b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2B 10484 bytes
font_03_sfnt_off0001520b.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1520B 16092 bytes

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