Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27ec7295dcedfd2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 21:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 33ad0aa47a62683f2c27bd11d8bfb49e SHA-1: 019f20f4f82f65a339b161d063710f82df6125cc SHA-256: e27ec7295dcedfd2a0c2cd947cb17e4a4a020d81ac8784901b5e196145fdc868
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The document body, though heavily obfuscated, suggests it is a PDF generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://americasbestwingsbeltsville.com/uploads/files/nodufutexapa.pdf In PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vesalobakefevepujuvi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f50482fe69ea22b2f5a4dada1158f7da/nafowagewoboged.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/nejabowuk.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109111046435017.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/87496877611.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/mifijexezal.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68682533135.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/52427309928.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/75234339231.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/83670295319.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/gomopugaruzudipirex.pdfIn PDF document text
    • https://masukpt1.com/contents/files/30807407373.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/425269bf44832d54f365ed89a93f3cfc/8914412279.pdfIn PDF document text
    • http://sartor.ru/upload/files/75664064192.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4pae1905s24tk4s2ivupscii22/rafeguxiludabedir.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/goxakutotujuzatinorori.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/22374817608.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21406409133.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/38059580455.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/vegavijalugalijuvemagi.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xifosegoratewedaf.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/juwepimusovitagozomupaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+conjuring+streaming+vfPDF 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10996 bytes
SHA-256: de3fb6d8fad2454852809942ae6307f0c5e16fb0f4f75d6bac7f69afc87226c2
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 18696 bytes
SHA-256: 4b0f2658db988cb1c26b631b977f075ba4f7247770be8ccdc7b655150f3a9aa3
font_02_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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