Malicious PDF — malware analysis report

Static analysis result for SHA-256 93523a578611a7a4…

MALICIOUS

PDF

78.1 KB Created: 2021-06-27 08:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5e3f1b61d362d7fce906f7713504a97 SHA-1: cd6dfa8d6867eb0065773c79fcfd49e0f815b97f SHA-256: 93523a578611a7a46a57336c94d0d9dbdd65a4fc9dc80239276b91c760bf5ee8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and the 'link farm' heuristics strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/72227200883.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21841185cd6016e8f8c4d2d02e3120d5/64270032031.pdf
    • https://larrialdiak.es/files/galeria/files/wivopomotularirorofituf.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609909a738b3e---wefanujaxopunaboj.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160afd533bbfbd---64329835397.pdf
    • https://footballsod.com/images/ck-uploads/files/dikufes.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/09f9e7636be6f03c4d38bd0b11dc9695/takebuxufazosujajik.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb1575d13---14378476605.pdf
    • http://kokalietudarbnica.lv/files/files/nanumedavumowupuzelepitu.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e28a40135---zokatonokonukusebojadowe.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbeb179d44e8503a66ff76c11ca17cf6/jufifuxewokiminojubi.pdf
    • http://kleinschaden.expert/userfiles/file/buretuse.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092566c346ac---dakepeligubiwefuvenil.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sft417447c1e16qfcsrkvo66dn/gezolibapalokexofufop.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160700ba8f35bd---xokiwobep.pdf
    • https://marblobaths.com/app/webroot/img/files/junolofesega.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae12df86a9b---wunenivuxuf.pdf
    • http://feldbach-tourismus.at/files/zafafoponofigonuremoze.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920338dae60---lonoxedusesera.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725a688fc22---40028710245.pdf
    • http://ptaki.info/imgekoprojekty/files/54067895405.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6960852f---15151493515.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbd4cf132---jawosex.pdf
    • http://dafangtour.com/fckeditor/userimages/file/dumomov.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/db2c3fd0548811039ee235bd81890f72/40332293555.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=da+photo+fort+campbell
    • 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_off0000ceb2.bin
ec0c33a26fe85cb89f81c9c841b44e6221e3c17686d4545d2f70ce27661e1327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 10520 bytes
font_01_sfnt_off0000e676.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 16792 bytes
font_02_sfnt_off0000fe88.bin
d529d76ebc7c148baefab5641d7c8de35826e1851531ac9cb2b29770a6cb0c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 16856 bytes

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