Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec71ce43b4345f9…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 22:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0e0281d5225f14ada6c4f44fb929f16 SHA-1: d71c12c7a26b65a9644e59c70c6aaa46c91e3dfc SHA-256: cec71ce43b4345f9ebce0a721d81bbee5d015575a8b91056c17c39d0c7fb6dbf
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'Fake CAPTCHA' heuristic indicates the document is designed to deceive users into performing an action, likely to execute a payload. Multiple URLs point to compromised CMS uploads and link farms, suggesting an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef6a369d2---26806305317.pdf In PDF document text
    • http://photou.cc//ckfinder/userfiles/files/zaluzukix.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/sewemugakafolopomejimepi.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/wasijemejomifanuvogubej.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1816a9f3---91504247220.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/g5i24oadl29bce0srhe8q2ng3q/18545383436.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/titeziv.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/akgrqqg6197mfakk5tm5shrfgh/nizukij.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xezupetumosafofirubeli.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/atnck4gks6jgc87trcu06u90o2/telulufele.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161218dde430eb---kabogubilanofedazuredigum.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a844de66d9f---12027782041.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/55185723487.pdfIn PDF document text
    • https://aedwea.com/upload/foto/ropozuvofofep.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b1a6na6m4tvfacuh9ua9lcm19q/gubedife.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/90466537047.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/eb89a46936a2aff1f8e1b29f9b0edea1/95743123653.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/30890664975.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kaxafemelujumej.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51708843e---22942211353.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2d0afeaf---vopawagupubokunoxin.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094007c05d2f---wajulikazotiluvonogugag.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c09e2b475421e1e800bd42be526e4df/43370516839.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/96559212869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=meeseva+citizen+charter+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_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 18768 bytes
SHA-256: 5de70a397f81f1112dd199e35b9ec0f0bc58e9b8ce178a4e22f48421f5cd27ee
font_01_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001403a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403A 10668 bytes
SHA-256: 3f8112ecb1945159d60c0b43c1ff1a32771c7dcb99b802aeb318bdd5e8183fa4

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