Malicious PDF — malware analysis report

Static analysis result for SHA-256 41efe17b9e495a4f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78645ebf6a1323bfb5a8c82efb781140 SHA-1: d336120c047dd446635adccb03746ad0ce5817ce SHA-256: 41efe17b9e495a4fadfafe0b4505ff36c67539ef160fec3afb3bd67b7ae9ea5c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of callback phishing or tech-support scams by presenting a lure to call a phone number. The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting an attempt to host malicious content or redirect users. No scripts were extracted from this sample, limiting the analysis of its execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://sosnovgeo.ru/userfiles/file/36867451988.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/20650adaa9980ae666bc5c626fdbc608/razeda.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/8360048329.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7884dba1b1---jijabezewujusew.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/724868df0918af7cf3f8419ad1bce271/wifefosipitatu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/libokixifu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959709f300---3459540030.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/286f84dd90742af02fddd934fd793eda/gevevanini.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/gavaxitulobeditexifelikov.pdfIn PDF document text
    • http://zxsolar.com/d/files/57384971356.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021072322355473499.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/goxuzafuwamowex.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0edb59c5---27854241264.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/28375710710.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/69543686618.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/534fb19dc20e7b9fdd531077ecc5df88/94723701188.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/woxidisibumilefezosad.pdfIn PDF document text
    • http://airfa.it/userfiles/file/betego.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a8ec14fd6---kigavogelora.pdfIn PDF document text
    • http://mfahk.com/upload/files/68061570406.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d59b040b---jigoru.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/98730746595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bahujan+samaj+party+manifesto+2019+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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 16840 bytes
SHA-256: b02da8b73646f661d185cb6cae2fccc3a091c798edb2a4acc9dfece88cb17eee
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 11576 bytes
SHA-256: a2863e0b8e3a7e81448b1877a485ab4ea545b83561c6fca7b7d727e1ac55957c
font_02_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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