Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee4ae4f8aedccc5…

MALICIOUS

PDF

82.2 KB Created: 2021-06-28 04:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ace018c8dbf13dabc2a7e8fa4401916b SHA-1: 73be2a24346d63749f5c4601feaf5ef3a03e6e3b SHA-256: 5ee4ae4f8aedccc59648ff8cbf511b9af65d7facd2893543a38a018778f3588b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics and embedded URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cakenepal.com/userfiles/file/81495281534.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a7111598b37847ad53fcf99553e40748/nufalov.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/gbrvs20utdnc4mbd86g8em70tg/tunibanonujujubovutadixu.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a921e6672---72688225955.pdf
    • https://ecohort.com/userfiles/files/lixemopowoponurezodom.pdf
    • http://al-bandak.com/userfiles/file/pazogegotonaramiw.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ef212e492---21383933217.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bsmoaavkctm2smt3j31cvh5p72/56545125559.pdf
    • http://veraschwemmle.de/fckdata/file/dudarokovavafeduma.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d403747502---newomidibonojaforilakamed.pdf
    • https://stillwaiting.org/userfiles/file/xedabebitefomoxol.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2e08988b87526f847fc95982af01231f/gonisisidumejulajovesifoz.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be9ae96ec6b---2248593374.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/29182407154.pdf
    • http://geologocarmignani.com/userfiles/files/vagugeramawedijurafem.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877326be1---xowisojukijipu.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/42018db6f603fd1b957380caddfb36da/54405902925.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c8f9d8a63---24814952338.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb8c3dbf5---loripopipotisamakufi.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608434b64fac8---bigebezo.pdf
    • http://elitaliaweb.it/upload/file/19277617938.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61ec3f436---41242605755.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ca9be42a7294f86cab534490fe47beb3/zuraguxarefetarusabuwagas.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6eflgkfen8kd185r9tnl3oddg3/71561980999.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zuliziri.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d840da42a---fitoka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=amma+kavithai+in+tamil+images
    • 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_off0000e131.bin
88556c2f020b731879e3eb7cf48745b4d39079aeeba46eb0be483906cf8080a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 16660 bytes
font_01_sfnt_off00010b7b.bin
1e7e70b77c50c1a736ea2fc38fed13740559b3646779c324aa4b18d61b4a0fc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10472 bytes
font_02_sfnt_off0001231c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 16792 bytes